Which of the following is true for a gas under conditions of very low temperature? PV ÷ nRT = 1, because all gases behave ideally at very low temperatures. PV ÷ nRT = 1, because the actual volume of the gas molecules becomes considerable. PV ÷ nRT > 1, because the low temperatures speed up the particles. PV ÷ nRT < 1, because particles are unable to overcome intermolecular attractions.
Answers
Related Questions
The strict conservationist philosophy for using Federal lands states that:
Answers
The federal government tried to appease conservationists and businesses in its land-use policies.
What is the Federal government?A form of government in which power is distributed between a central authority and a number of constituent territorial units.
During the early times of the Gilded Age, the government agency workers felt pressure and uncertainty between the interests of businesses and conservationists due to the reason that the federal government were dependent on the contributions from businesses. On the contrary, conservation efforts are being favoured more by the voters.
The federal government influences interest rates and then it takes six months for the economy to pick that up and that provides steady growth and good GDP for the USA.
The federal government does not fix prices for products. The fed tries to fix interest rates.
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985 grams converted to kilometers
Answers
Answer:
?
Explanation:
did you mean kilograms?
The National Stock Number (NSN) test search is used to locate test reports and Special Packaging Instructions (SP) on which of the following?
Answers
The NSN test search is used to locate test reports that provide comprehensive information about the testing and evaluation of specific products or items.
The National Stock Number (NSN) test search is used to locate test reports on various products or items. Test reports provide detailed information about the testing and evaluation of a particular product's performance, quality, safety, or compliance with specific standards or requirements. These reports are often conducted by independent testing laboratories or organizations to assess the characteristics and capabilities of the product.
The NSN test search allows users to search for test reports based on the NSN, which is a unique identification number assigned to each item in the federal supply system. By inputting the NSN into the search, individuals or organizations can access relevant test reports associated with that specific item or product.
The test reports obtained through the NSN test search can be valuable for various purposes, such as quality assurance, product development, procurement decisions, or regulatory compliance. They provide important insights into the performance and reliability of the item being tested, allowing users to make informed decisions based on objective evaluation and testing data.
In summary, the NSN test search is used to locate test reports that provide comprehensive information about the testing and evaluation of specific products or items.
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4 A student is given 2 different objects, a marble and a cube that apear to be the same substance. The student did Some measurements of the objects and recorded
the measurements. What is the best determination
Answers
The best determination by the student is objects are different substances because their densities are different.
A marble and a cube is having different masses even if it appears to be the same substance. The student understood by taking measurements that it differs a lot since the different object has different measurements due to various factors like mass, density, etc: even if the appearance is the same.
The substance's mass per unit of volume is known as its density (volumetric mass density or specific mass). Although the Latin letter D may also be used, the sign most frequently used for density is (the lowercase Greek letter rho). The formula for density is mass divided by volume:
ρ = m / V
The intrinsic quality of matter is density. It is independent of the substance's concentration. It is a quality shared by the substances. The thickness of two substances must be equal for them to be equal.
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Based on their number of valence electrons, which group of elements will gain two electrons by bonding with other atoms?
Question 1 options:
Be, Mg, Ca, Sr, Ba
F, Cl, Br, I, At
O, S, Se, Te, Po
N, P, As, Sb, Bi
Answers
Answer:
O, S, Se, Te, Po
Explanation:
Oxygen, sulphur, selenium, tellurium and polonium are all members of group sixteen. The elements in group sixteen all possess six electrons in their outermost shell. Recall that an atom is said to stable if it contains eight electrons in its outermost shell. This is also referred to as the octet rule. Hence atoms of elements obey the octet rule when they combine to form compounds with eight electrons present on the outermost shell of each atom.
Having six electrons on their outermost shell implies that they need to gain two electrons by bonding to other atoms of other elements. Two examples will suffice here.
Water is formed when an oxygen atom shares an electron with each hydrogen atoms.
Hydrogen sulphide is formed when sulphur share two electrons with two hydrogen atoms. Hence the answer.
Answer:
O, S, Se, Te, Po
Explanation:
Hello,
In this case, when chemical bonds are formed, the valence electrons are the bridge to make it possible, nevertheless, the octet is the limit for the formation of bonds, that is, an element must not exceed 8 shared or gained electrons. In such a way, elements able to gain to electrons to attain the octet are those from the VIA group: O, S, Se, Te, Po, as they have six valence electrons, so two more electrons are suitable for attaining the octet.
Best regards.
When the following equation is balanced properly under acidic conditions, what are the coefficients of the species shown?CIO3 +NO 2-CI +Water appears in the balanced equation as aNO3How many electrons are transferred in this reaction?(reactant, product, neither) with a coefficient of(Enter 0 for neither.)
Answers
Answer:
Explanation:
Here, we want to balance the given equation in acidic conditions
We start by breaking the equation into half equations
We have that as:
\(\begin{gathered} ClO_3^-\text{ }\rightarrow\text{ Cl}^- \\ NO_2\rightarrow\text{ NO}_3^- \end{gathered}\)The next step is to balance other elements aside from oxygen and hydrogen
This is already done
The next step is to balance oxygen by adding H2O:
\(\begin{gathered} ClO_3^-\text{ }\rightarrow\text{ Cl}^-\text{ +3 H}_2O \\ NO_2\text{ + H}_2O\text{ }\rightarrow NO_3^-\text{ } \end{gathered}\)The next step is to balance hydrogen by adding the hydrogen ion
We have that as:
\(\begin{gathered} ClO_3^-\text{ + 6H}^+\text{ }\rightarrow Cl^-\text{ + 3H}_2O \\ NO_2\text{ + H}_2O\text{ }\rightarrow\text{ NO}_3^-\text{ + 2H}^+ \end{gathered}\)The next step here is to balance the excess ions by adding electrons:
\(\begin{gathered} ClO_3^-\text{ + 6H}^+\text{ + 4e}^-\rightarrow\text{ Cl}^-\text{ + 3H}_2O \\ NO_2\text{ + H}_2O\text{ }\rightarrow\text{ NO}_3^-\text{ + 2H}^+\text{ + e}^- \end{gathered}\)Now, we need to cancel out the electrons.
We multiply equation ii by 4:
\(\begin{gathered} ClO_{3\text{ }}^-\text{ + 6H}^+\text{ + 4e}^-\text{ }\rightarrow\text{ Cl}^-\text{ + 3H}_2O \\ 4NO_2\text{ + 4H}_2O\text{ }\rightarrow\text{ 4NO}_3^-\text{ + 8H}^+\text{ + 4e}^- \end{gathered}\)Now, let us merge the two equations:
\(ClO_3^-\text{ + 4NO}_2\text{ + H}_2O\text{ }\rightarrow\text{ Cl}^-\text{ + 4NO}_3^-\text{ + 2H}^+\)What do the atoms in Group 1 of the periodic table have in common
Answers
Explanation:
The group 1 elements have similar properties because of the electronic structure of their atoms- they all have one electron in their outer shell.
I hope it's helpful!
A certain blue light has a frequency of 6.91x 1014 Hz. What is the wavelength of the light? Explain.
Answers
Answer:
The energy for a quantum of light is 2.84 x 10-19
try that
How many grams of SO2 would you need to dissolve in 100g of 40 degree water to make a saturated solution?
If you heated the solution to 90 degrees would the new solution be unsaturated, or supersaturated?
Answers
The grams of SO₂ that would be dissolved in 100 g of 40 degree water to make a saturated solution can be calculated by making solubility curve.
What is mass?Mass is the quantity of matter of a physical body.
If you want to calculate the mass of Sulfur dioxide in 100 g of 40 degree, you have to make a solution curve.
With the increase in temperature, the solubility increases as well
Thus, the grams of SO₂ that would be dissolved in 100 g of 40 degree water to make a saturated solution can be calculated by making a solubility curve.
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Which of the following chemicals does not occur naturally?
Answers
Answer:
Explanation:
O2
A molecule, that is sp3d2 hybridized and has a molecular geometry of square pyramidal, has ________ bonding groups and ________ lone pairs around its central atom a molecule, that is hybridized and has a molecular geometry of square pyramidal, has ________ bonding groups and ________ lone pairs around its central atom
Answers
A molecule that is sp³d² hybridized and has a molecular geometry of square pyramidal has 5 bonding groups and 1 lone pair around its central atom.
A molecule that is hybridized and has a molecular geometry of square pyramidal has 6 bonding groups and 0 lone pairs around its central atom. The hybrid orbitals are directed towards the vertices of a square pyramid.
In the sp³d² hybridization, the central atom has a total of 6 electron domains, consisting of 5 bonding groups (each representing a bond with another atom) and 1 lone pair (representing a pair of non-bonding electrons).
The arrangement of these electron domains results in a molecular geometry of square pyramidal, where the bonding groups occupy the corners of a square base and the lone pair is located above the center of the square base, giving it a pyramidal shape.
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Temperature is an example of a variable that uses: a) the ordinal scale. b) the ratio scale. c) the interval scale. d) either the ratio
Answers
This translates to the fluctuating temperature using interval scale in Fahrenheit and Celsius.
What does interval scale mean in plain English?Periodic Scale
It is described as a quantitative measuring scale where a noticeable difference may be found between the two variables. In other words, the measurements are precise rather than relative, where the occurrence of zero is arbitrary.
Data on an interval scale is what?The definition of interval data, often known as an integer, is a data type that is measured along a scale with each point being situated at an equal distance from the other. Interval data always takes the form of integers or numerical values with a standard and equal distance between the two sites.
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Which group (family) of non-metals does not form ions?
Answers
Answer:
Noble gasses
Explanation:
nobled gasses
all elements want to loose or gain electrons to be like the noble gasses in bonding but the noble gasses do not bond.
Even before modern observations provided evidence supporting the theory of plate tectonics, people developed theories that the continents were once joined together. Using only maps, what did they observe?
Answers
Answer:
people or scientist tend to observe the nature of the continents that described by jigsaw fit,geological similarity among the continents
MULTIPLE CHOICE QUESTION
Substances that would be described as an Element (such as Argon gas Ar,
fluorine gas F2, pure metal like gold Au ) have an oxidation state of what
number?
mentary
2
3
-1
1
O
Answers
Answer:
the oxidation number of those elements is 2 because some of them are molecules
Sec. 5.1: “Simple Ions”
1) How much an element __________ depends on its ________________ configuration.
a) __________ gases are the __________ reactive elements because their outer energy levels
are ____________ with ______ electrons.
(except He, which is full with 2)
b) In most chemical reactions, atoms try to ______________ the electron configurations of the
noble gases by either ______________ or _______________ electrons.
c) Most atoms want to become __________.
2) Octet rule: a concept of chemical ______________ theory that is based on the assumption that
______________ tend to have either ________________ valence shells (energy levels) or
_____________ valence shells of _________ electrons. “8 is _____________”
3) **_____________ Metals and ____________ are the _____________ Reactive Elements
a) As members of Group _____, alkali metals have only _____ electron in their outermost
__________ __________.
b) By _____________ that 1 electron, an ___________ metal can get an electron configuration
like a ____________ gas, with ______ electrons in its outermost energy level.
c) 1s22s22p63s23p64s1
_________________
Potassium will lose the 1 electron in the 4th energy level so that its outmost energy level is empty.
4) Remember, potassium’s electron configuration was 1s22s22p63s23p64s1
a) Question: Why doesn’t potassium gain 7 electrons to become stable instead of losing 1?
Answer: _______________________________________________________________
5) As members of Group _____, the halogens have _____ electrons in their outermost
__________ __________.
a) By gaining _____ electron, a __________ can get an electron configuration like a
__________ gas, with _____ electrons in its outermost energy level.
b) 1s22s22p63s23p5 _________________
Chlorine will gain 1 electron to make its outmost energy level full.
6) After it __________ one electron, potassium has the __________ electron configuration as
____________ does after it __________ one electron.
a) Both are the same as the noble gas ___________. 1s22s22p63s23p6
b) The atoms of many ____________ become __________ by achieving the electron
configuration of a __________ __________.
c) Remember, the ___________ in the outermost energy level are called _________ electrons.
7) To find out how many ______________ electrons an atom has, check the _____________
_____________.
a) Magnesium, Mg, has the shorthand electron configuration: [Ne] 3s2
b) The outermost energy level is the _______ energy level.
c) This means that a magnesium atom has _______ _____________ electrons, both in the 3s
orbital.
8) The shorthand electron configuration for phosphorus, P, is: [Ne] 3s23p3
a) The outermost energy level is the ________ energy level.
b) This means that each phosphorus atom has ________ valence electrons: _______ in the 3s
orbital, and _____ in the 3p orbital.
9) Atoms Gain or Lose Electrons to Form __________ __________.
a) All atoms are _______________ because they have ___________numbers of
____________ and _____________.
b) For example, a potassium atom has _________ protons and 19 ____________.
c) After _______________ 1 electron, potassium still has _______ protons but now only has 18
_________________.
d) Because the numbers are ________ the same, there is a net _________________ charge.
10) Ion: an atom, radical, or molecule that has ______________ or ____________ one or more
_______________ and has a _______________ or _____________ charge.
a) Show how a potassium atom forms an ion with a 1+ charge:
b) Cation: an ___________ that has a ______________ charge. (think of the cat!)
11) In the case of chlorine, far less __________ is required for an atom to __________ one
electron rather than lose its ________ valence electrons to become _____________.
a) Show how a chlorine atom forms an ion with a 1- charge:
b) Anion: an _______ that has a ___________ charge. (think of the ant!)
12) Both an __________ and its __________ have the same number of __________ and
__________ so the nuclei are the same.
a) But, an atom and its ion have _______________ numbers of _________________.
b) The chemical properties of an atom depend on the __________ and configuration of its
___________.
c) So, an atom and its ion have __________ __________ __________!!!
Answers
The chemical properties of an atom of an element depends on its electronic configuration.
Ions are formed by loss or gain of electrons by atoms.
What is electronic configuration of an atom?Electronic configuration is the arrangement of electrons around the nucleus of an atom.
How much an element reacts depends on its electronic configuration.Noble gases are the least reactive elements because their outer energy levels are filled with octet electrons. (except He, which is full with 2)In most chemical reactions, atoms try to have the electron configurations of the noble gases by either losing or gaining electrons.
Most atoms want to become stable.
What is the octet rule?Octet rule is a concept of chemical bonding theory that is based on the assumption that atoms tend to have either empty valence shells (energy levels) or full valence shells of eight electrons. “8 is octet”
What are Alkali metals and Halogens?Alkali Metals and Halogens are the most Reactive Elements
As members of Group 1, alkali metals have only one electron in their outermost shell.By losing that 1 electron, an alkali metal can get an electron configuration like a noble gas, with eight electrons in its outermost energy level.1s22s22p63s23p64s1 is the electronic configuration of potassium.
Potassium will lose the 1 electron in the 4th energy level so that its outmost energy level is empty.
Potassium does not gain 7 electrons to become stable instead of losing because the energy associated with losing one electron is less than that needed to gain 7 electrons.
As members of Group 7, the halogens have seven electrons in their outermost shell.By gaining one electron, a halogen can get an electron configuration like a noble gas, with eight electrons in its outermost energy level.1s22s22p63s23p5 is the electronic configuration of chlorine
Chlorine will gain 1 electron to make its outmost energy level full.
After it losing one electron, potassium has the same electron configuration as chlorine does after it gains one electron.
Both are the same as the noble gas argon 1s22s22p63s23p6
The atoms of many elements become stable by achieving the electron configuration of a noble gas.The electrons in the outermost energy level are called valence electrons.What are valence electrons?To find out how many valence electrons an atom has, check the shorthand electronic configuration.
Magnesium, Mg, has the shorthand electron configuration: [Ne] 3s2
The outermost energy level is the 3 energy level.
This means that a magnesium atom has two electrons, both in the 3s
orbital.
The shorthand electron configuration for phosphorus, P, is: [Ne] 3s23p3
The outermost energy level is the 3 energy level.
This means that each phosphorus atom has five valence electrons: 2 in the 3s
orbital, and 3 in the 3p orbital.
What are ions?Atoms Gain or Lose electrons to form ions.All atoms are different because they have different numbers of protons and electrons.For example, a potassium atom has 19 protons and 19 electrons .
After losing 1 electron, potassium still has 19 protons but now only has 18 electrons .
Because the numbers are not the same, there is a net positive charge.
An Ion is an atom, radical, or molecule that has lost or gained one or more electrons and has a positive or negative charge.
The formation of potassium ionPotassium atom forms an ion with a 1+ charge in the following step:
K ---> K+ + e-
What are Cations and Anions?Cation: an ion that has a positive charge.In the case of chlorine, far less energy is required for an atom to gain one
electron rather than lose its seven valence electrons to become stable.
Show how a chlorine atom forms an ion with a 1- charge:
Cl + e- ----> Cl-
Anion: an ion that has a negative charge.Both an atom and its ion have the same number of protons and neutrons so the nuclei are the same.
But, an atom and its ion have different numbers of electrons.
The chemical properties of an atom depend on the number and configuration of its electrons .
So, an atom and its ion have same number atomic number.
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calculate the number of atoms in 1.28g of copper
Answers
To calculate the number of atoms in a given mass of a substance, we need to use the concept of molar mass and Avogadro's number.
1. First, we determine the molar mass of copper (Cu) from the periodic table. The molar mass of copper is approximately 63.55 grams per mole.
2. Next, we calculate the number of moles of copper in 1.28 grams by dividing the mass by the molar mass:
Number of moles = mass / molar mass
Number of moles = 1.28 g / 63.55 g/mol
3. Now, we can use Avogadro's number, which is approximately 6.022 x 10^23 atoms per mole, to convert the number of moles to the number of atoms:
Number of atoms = number of moles x Avogadro's number
Number of atoms = (1.28 g / 63.55 g/mol) x (6.022 x 10^23 atoms/mol)
Calculating this, we find that the number of atoms in 1.28 grams of copper is approximately 2.58 x 10^22 atoms.
Note: It is always important to use the correct molar mass and Avogadro's number, as they may vary slightly depending on the source or the isotopes of the element considered.
Kindly Heart and 5 Star this answer and especially don't forgot to BRAINLIEST, thanks!If [AlF6]-3 is dissolved in pure water, what will be true about the system? Select the correct answer below: A. [Al^3+] = [F^-] B. [Al^3+] > [F^-] C. [Al^3+] < [F^-] D. impossible to tell
Answers
If [AlF₆]³⁻ is dissolved in pure water, the concentration of aluminum ions (Al³⁺) will be less than the concentration of fluoride ions (F⁻). So, the answer is C. [Al³⁺] < [F⁻].
When [AlF₆]³⁻ is dissolved in pure water, it undergoes hydrolysis, resulting in the formation of aluminum ions (Al³⁺) and fluoride ions (F⁻). The hydrolysis reaction can be represented as follows:
[AlF₆]³⁻ + 3H₂O ⇌ Al³⁺ + 6F⁻ + 3OH⁻
Since water acts as a source of hydroxide ions (OH⁻), the concentration of hydroxide ions will increase in the solution.
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Which statement about tendons and ligaments is true?
a. Ligaments connect muscle to bone
b. Tendons connect muscle to bone
c. Ligaments connect bone to bone
d. Tendons connect bone to bone
Answers
Answer:
Option C is true to be honest
Answer:
i put c and got it wrong its b
Explanation:
what is the molarity of a solution consisting of 6.0 moles of nacl dissolved in a total 3.0l of solution
Answers
The molarity of a solution consisting of 6.0 moles of nacl dissolved in a total 3.0l of solution is 2.0 M.
The molarity of the solution is calculated by dividing the moles of solute by the volume of solution in liters. In this case, we have 6.0 moles of NaCl dissolved in a total volume of 3.0 liters of solution.
Therefore, the molarity of the solution is:
Molarity = moles of solute / volume of solution in liters
Molarity = 6.0 moles / 3.0 liters
Molarity = 2.0 M
So, by calculating the molarity of the solution, the result is 2.0 M (M stands for molar, which is a unit of concentration).
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The solubility product constant at 25°C for AgI(s) in water has the value 8.3 × 10–17. Calculate ∆Grxn at 25°C for the process AgI(s) <--> Ag+(aq) + I– (aq) where [Ag+] = 9.1 × 10–9 and [I–] = 9.1 × 10–9. –91.7 kJ/mol +91.7 kJ/mol 0.0 kJ/mol –4.4 kJ/mol +4.4 kJ/mol
Answers
Answer:
+91.7 KJmol-1
Explanation:
Recall that ∆G= -RTlnK
Since ∆G in this case is ∆Grxn and K is the Ksp
Note that the Ksp is the solubility product (as shown by the reaction equation)
∆Grxn is the change in free energy for the reaction, in this case the ionization of the silver iodide into silver and iodide ions.
R= 8.314JK-1 and T =25°C +273 = 298 K (the centigrade temperature must be appropriately converted to its corresponding absolute absolute before proceeding with the calculation)
Hence we can substitute values accordingly;
∆Grxn = -(8.314 × 298 × ln 8.3×10^-17)
∆Grxn = +91.7 KJmol-1
a Disscuss different types of frictions b Explain friction is necessary evil c Why should friction be reduced
Answers
The Types of Friction are;
Static FrictionKinetic FrictionRolling FrictionWhat is the frictionsStatic Friction is a type of friction that stops objects from moving when a force is added and they aren't moving.
Kinetic friction happens when two things are rubbing against each other while they are moving. It tries to stop things from moving too fast.
Rolling friction happens when something rolls on a surface. Like a wheel moving on the ground. When objects move, it is easier for them to keep going because rolling friction (friction when something rolls) is usually less than kinetic friction (friction when something slides).
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\({\huge{\underline{\underline{\tt{\green{Answers}}}}}}\)
______________________________________
Answer a.The different types of friction are:
static frictionsliding frictionrolling frictionfluid friction.______________________________________
Answer b.Friction is often called a necessary evil because it can be both helpful and harmful. On the one hand, friction is what allows us to walk, drive, and write, and it prevents objects from slipping and sliding out of our hands. On the other hand, friction can cause wear and tear on machines and vehicles, generate heat that can damage materials, and slow down or stop moving objects.
______________________________________
Answer c.Friction should be reduced in certain situations to increase efficiency and reduce wear and tear. For example, reducing friction in engines and machines can increase fuel efficiency and decrease maintenance costs. However, friction should not be reduced in situations where it is necessary for safety, such as in car brakes or shoes.
______________________________________
What is the molar mass of carbon disulfide (cs2)
Answers
76.139 g/mol
I hope that helps
how many CO2 molecules exist in the following reaction? C3H8 + 5O2 >>> 3CO2 + 4H2O
Answers
Answer:
21.0g of CO2
Explanation:
The Liquified Petroleum Gas (LPG) has the composition of 60% Propane (C 3
H 8
) and 40% Butane (C 4
H 10
) by volume: (a) Find the wet volumetric and gravimetric analysis of the products of combustion when the equivalence ratio (Φ)=1.0. (b) What is the stoichiometric air to fuel ratio for the LPG.
Answers
The balanced combustion reaction for propane can be represented as:
C₃H₈ + (5/2)O₂ → 3CO₂ + 4H₂O
And the balanced combustion reaction for butane can be represented as:
C₄H₁₀ + (6.5)O₂ → 4CO₂ + 5H₂O
Since LPG is composed of 60% propane and 40% butane by volume, we can calculate the wet volumetric and gravimetric analysis based on these proportions.
Wet volumetric analysis:
For the wet volumetric analysis, we consider the volume of the products of combustion relative to the volume of the LPG consumed.
Propane (C₃H₈):
The stoichiometric coefficient of propane in the combustion reaction is 3. Therefore, for every mole of propane burned, we will have 3 moles of CO₂ and 4 moles of H₂O formed.
Butane (C₄H₁₀):
The stoichiometric coefficient of butane in the combustion reaction is 4. Therefore, for every mole of butane burned, we will have 4 moles of CO₂ and 5 moles of H₂O formed.
Considering the initial composition of 60% propane and 40% butane by volume, we can calculate the volumetric composition of the products of combustion:
Volumetric composition of CO₂:
(0.6 * 3) + (0.4 * 4) = 3.6
Volumetric composition of H₂O:
(0.6 * 4) + (0.4 * 5) = 4.6
Therefore, the wet volumetric analysis of the products of combustion is 3.6 parts CO₂ to 4.6 parts H₂O.
Wet gravimetric analysis:
For the wet gravimetric analysis, we consider the mass of the products of combustion relative to the mass of the LPG consumed.
Using the molar masses of the compounds involved in the combustion reaction:
Molar mass of CO₂ = 44 g/mol
Molar mass of H₂O = 18 g/mol
Gravimetric composition of CO₂:
(0.6 * 3 * 44 g/mol) + (0.4 * 4 * 44 g/mol) = 158.4 g
Gravimetric composition of H₂O:
(0.6 * 4 * 18 g/mol) + (0.4 * 5 * 18 g/mol) = 74.4 g
Therefore, the wet gravimetric analysis of the products of combustion is 158.4 grams CO₂ to 74.4 grams H₂O.
(b) The stoichiometric air to fuel ratio for LPG can be determined based on the balanced combustion equations for propane and butane.
For propane (C₃H₈):
C₃H₈ + (5/2)O₂ → 3CO₂ + 4H₂O
The stoichiometric coefficient for propane is 1, which means we need 5/2 moles of O₂ for every mole of propane.
For butane (C₄H₁₀):
C₄H₁₀ + (6.5)O₂ → 4CO₂ + 5H₂O
A chemist titrates 190 ml of. 2412 nitrous acid solution with. 377 M KOH solution. Calculate the ph at equivalence. The pKa of nitrous acid is 3. 35
Answers
The equivalency solution has a pH of 2.624.
What is the procedure for making nitrous acid?Nitrous acid is frequently created by adding a mineral acid to aqueous sodium nitrite solutions. Typically, acidification is carried out at ice-cold temperatures, and HNO2 is consumed on-site. Nitrous acid in its free form is unstable and breaks down quickly.
In a neutralization process, weak nitrous acid (HNO2) reacts with strong basic KOH.
HNO2 + KOH → KNO2 + H2O
Then, we determine how many moles of KOH were used:
volume KOH x concentration equals moles KOH. KOH
moles KOH = 0.190 L x 0.377 mol/L
moles KOH = 0.07153 mol
Next, we calculate the initial concentration of HNO2:
concentration HNO2 = moles HNO2 / volume HNO2
concentration HNO2 = 0.07153 mol / 0.190 L
concentration HNO2 = 0.3765 M
[HNO2] = 0.5 x 0.3765 M
[HNO2] = 0.1883 M
The following equation can be used to model how nitrous acid dissociates in water:
HNO2 + H2O ⇌ H3O+ + NO2-
The following equation relates the pKa to the acid dissociation constant, Ka, for this reaction:
pKa = -log Ka
So we can find the Ka value from the given pKa:
pKa = -log Ka
3.35 = -log Ka
Ka = 10⁻³
Ka = 4.47 x 10⁻⁴
The relationship shown below is true for the concentrations of the species involved at equilibrium:
Ka = [H3O+][NO2-] / [HNO2]
Ka = [H3O+][NO2-] / [HNO2]
Ka = [H3O+] [HNO2]
Solving for [H3O+], we get:
[H3O+] = Ka / [HNO2]
[H3O+] = (4.47 x 10⁻⁴) / (0.1883 M)
[H3O+] = 0.002374 M
Finally, we can calculate the pH of the solution:
pH = -log[H3O+]
pH = -log(0.002374)
pH = 2.624
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what will be the result of the following errors in tlc technique? a. too much sample applied to the tlc plate b. 100% ethyl acetate was used as eluent c. solvent pool in developing chamber too deep d. forgetting to remove the tlc plate from the chamber
Answers
a. If too much sample is applied to the TLC plate, the spots will become too large and may overlap, making it difficult to accurately analyze the components. This may also lead to uneven separation and inaccurate results.
b. If 100% ethyl acetate is used as the eluent, there may be poor separation of components as some compounds may not be soluble in pure ethyl acetate. It is recommended to use a mixture of solvents to optimize separation.
c. If the solvent pool in the developing chamber is too deep, it may lead to uneven migration of the compounds and poor separation. This can also result in a longer developing time and decreased resolution of components.
d. Forgetting to remove the TLC plate from the chamber can result in over-development and overexposure of the spots, making it difficult to accurately analyze the components. It can also lead to the plate becoming stuck to the chamber or damage to the plate.
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78.03 / 1.008 Sig Fig
Answers
Answer: The answer is 77.41 please let me know if I'm wrong :(
Explanation:
Answer:
1.008 has 4 significant figures (sig figs), and 3 decimals. See the steps with this sig fig calculator.
Explanation:
Plz help!!! How do I answer these??? :( I don’t get this at all!! Please help
Sorry meant to put under biology!
Answers
Answer:
1) 60°
2) 60°
3) 45°
4) E
5)90°
6) E
What is the pressure applied when a force of 200 N acts on an area of 0.5 m??
Answers
Answer:
P = 200/5 = 40 Pa.
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