Answer:
119 g.
Explanation:
the volume required to get to the equivalence point is blank dependent on the concentration and volume of acid or base to be titrated and the base or acid used to do the titration because the equivalence point is blank the stoichiometry of the balanced reaction of the acid and base. the stoichiometry only considers the number of moles involved, blank the strength of the reactants involved.
Equivalence point is dependent on stoichiometry of balanced reaction of acid and base. Stoichiometry only considers number of mols involved, not strength of reactants involved.
To ascertain how much of a specific drug is present in a sample, an experiment called a b is done. A diprotic acid is one that has a two-proton (H+) capacity per molecule. Two equivalence points—points at which the number of moles of acid and base are equal—are present when a diprotic acid is titrated with NaOH. When all of the acids have been neutralised, the first equivalence point is reached; meanwhile, the second equivalence point is reached when the surplus base has been neutralised. The amount of NaOH solution required to go from the first equivalence point to the second equivalence point is twice the amount required to travel from the first equivalence point to the first equivalence point.
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What are the main sources of outdoor air pollution and how do they cause smog?
Answer:
The common sources of outdoor air pollution are emissions caused by combustion processes from motor vehicles, solid fuel burning and industry. Other pollution sources include smoke from bushfires, windblown dust, and biogenic emissions from vegetation (pollen and mold spores).
smog is produced when sunlight reacts with nitrogen oxides in the atmosphere. Nitrogen oxides come from car exhaust, coal power plants, and factory emissions. When sunlight hits these chemicals, they form airborne particles and ground-level ozone—or smog.
Grady is doing an experiment about the solubility of sugar. He puts 100 milliliters of water in each of three beakers. He leaves the first beaker at room temperature, heats the second beaker to 60°C, and heats the third beaker until the water boils at 100°C.
To the first beaker, he adds sugar, one spoonful at a time, until not all of the sugar can dissolve when he stirs it. He records the number spoonfuls that dissolved. Then he repeats the same process of adding sugar and stirring for the beakers of hot water and boiling water
Variables within an experiment many be altered in order to produce specific outcomes such as a reaction rate. The reaction rate is a measure of how fast a chemical reaction can happen. The increase in temperature increases the collision of molecules, such as the solid sugar solute and and the water molecules, which act as a solvent. Agitation, such as stirring, also increases the solubility by increasing collisions.
This continues until the solution becomes too saturated.
Mass of 2×10^21 number of atoms of an element is 0.4g. What is the mass of 0.5 mole of the element?
Answer:
66.7 g
Explanation:
Number of atoms = 2×10²¹
Mass of 2×10²¹ atoms = 0.4 g
Mass of 0.5 moles of that element = ?
Solution:
1 mole contain 6.022×10²³ atoms
2×10²¹ atoms × 1 mol / 6.022×10²³ atoms
0.33×10⁻² mol
0.003 mol
0.003 mole have mass of 0.4 g
0.5 mol have mass 0.5/0.003×0.4 g = 66.7 g
How many liters of .3M HCl are needed to neutralize 2.5L of 3M NaOH?
Answer: 2.5 lit
Explanation:
The density of titanium is 4.51 g/cm^3. what is the volume (in cubic inches) of 3.0 lb of titanium?
how do you find an unknown element
Answer:
There are two properties that can be used to identify an element: the atomic number or the number of protons in an atom. The number of neutrons and number of electrons are frequently equal to the number of protons, but can vary depending on the atom in question.
What gives yeast cells what it needed to reproduce and grow?
Answer:
Yeasts reproduce asexually by a process called budding (see Figure 8.2. 1 and Figure 8.2. 6). A bud is formed on the outer surface of the parent cell as the nucleus divides.
Explanation:
Calculate the mass of 6.023 x 10^4 molecules of manganese (IV) oxide(careful of your molecular formula).
1) First, we need to transform molecules into moles. For this, we use the avogadro constant:
6.023 × 10²³ moleculas ----- 1 mol
6.023 × 10⁴ molecules ------ x mol
x = 6.023 × 10⁴/ 6.023 × 10²³
x = 1 × 10⁻¹⁹ mol
2) Now we need to find the molecular formula of manganese (IV) oxide to find out its molar mass and transform 1 × 10⁻¹⁹ mol into grams (mass of it). The molecular formula of manganese (IV) oxide is MnO₂. So its molar mass: 54.94 + (2x16) = 86.94 g/mol
Now we use the following equation to find out the mass:
mass = moles × molar mass
mass = 1 × 10⁻¹⁹ × 86.94
mass = 86.94 × 10⁻¹⁹
mass = 8.7 × 10⁻¹⁸ grams
Answer: 8.7 × 10⁻¹⁸ grams
Give an example that illustrates the importance of chirality in a named biological molecule.
Answer:
Chirality is a particularly important concept in biology, because cells are mostly composed of chiral molecules. Small chiral molecules such as amino acids and sugars (figure 1, top) are the building blocks of larger molecules, such as proteins and nucleic acids, which are also chiral
20. The fermentation of glucose, C6H12O6, produces ethyl alcohol, C₂H5OH, and CO₂ as shown
here:
C6H12O6 (aq) → 2 C2H5OH(aq) + 2 CO2 (g)
C. How many molecules of CO2 form when 2.00 g of C₂H5OH are produced?
The fermentation of glucose, C6H12O6, produces ethyl alcohol, their number of molecules of CO2 form, when 2.00 g of C₂H5OH are produced, which is 3.913 g of ethanol.
Fermentation is a metabolic method that produces chemical adjustments in organic substrates thru the motion of enzymes. In biochemistry, it is narrowly defined as the extraction of electricity from carbohydrates in the absence of oxygen. Fermentation is the technique of sugars being broken down by using enzymes of microorganisms in the absence of oxygen into ethanol. Microorganisms including microorganisms and fungi have particular sets of metabolic genes, permitting them to produce enzymes to interrupt distinct types of sugar metabolites.
calculation;
1 mole of glucose produces 2 mol2 of CO mole of CO2
Mass of 1 mole of glucose = 180
A mole of 1 mole of ethanol = 46g
Since 180 grams of glucose produces = 92 grams of ethanol
92 grams of ethanol = 180 g of glucose
1 gram of C2H5OH = 180/92 g of glucose
∴ 2 g of C2H5OH = 180/92 × 2 g of glucose
= 3.913 g of ethanol
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You have three BSA working solutions: 5ug/ul, 0.5 ug/ul, and 0.05 ug/ul. Each tube contains 500 ul of solution. How much of which concentration(s) would you pipet into three different centrifuge tubes so you end up with 20 ug, 2 ug, and 0.2 ug of BSA in each tube
Answer:
I would pipet 4 μl of each BSA work solution
Explanation:
To calculate the mass (in μg), we have to multiply the concentration C (in μg/ul) by the volume V (in μl):
C(μg/ul) x V( μl) = mass (μg)
We found the required volume for each solution, as follows:
5 μg/μl x V₁ = 20 μg ⇒ V₁ = 20 μg/(5 μg/μl ) = 4 μl
0.5 μg/μl x V₂ = 2 μg ⇒ V₂ = 2 μg/(0.5 μg/μl) = 4 μl
0.05 μg/μl x V₃ = 0.2 μg ⇒ V₃= 0.2 μg/(0.05 μg/μl) = 4 μl
Therefore, we need to pipet 4 μl of the solutions of concentrations 5μg/μl, 0.5 μg/μl, and 0.05 μg/μl to obtain the masses 20 μg, 2 μg, and 0.2 μg, respectively.
4.5 tons → lbs
4.5 tons equals how many pounds
Answer:
9000 pounds
Explanation:
9000 pounds
Answer: 9000 lbs.
Explanation: 4.5 tons = 9000 pounds.
The homework question reads:
"A sample of gas in a cylinder of volume 3.42 L at 298 K
and 2.57 atm expands to 7.39 L by two different pathways.
Path A is an isothermal, reversible expansion. Path B has two
steps. In the fi rst step, the gas is cooled at constant volume to
1.19 atm. In the second step, the gas is heated and allowed to
expand against a constant external pressure of 1.19 atm until
the final volume is 7.39 L. Calculate the work for each path.
Answer:
Explanation:
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Answer : The work done for path A and path B is -685.3 J and -478.1 J respectively.
Explanation :
To calculate the work done for path A :
First we have to calculate the moles of the gas.
where,
= initial pressure of gas = 2.57 atm
= initial volume of gas = 3.42 L
n = moles of gas = ?
R = gas constant = 0.0821 atm.L/mol.K
T = temperature of gas = 298 K
Now put all the given values in the above formula, we get:
According to the question, this is the case of isothermal reversible expansion of gas.
As per first law of thermodynamic,
where,
= internal energy
q = heat
w = work done
As we know that, the term internal energy is the depend on the temperature and the process is isothermal that means at constant temperature.
So, at constant temperature the internal energy is equal to zero.
The expression used for work done will be,
where,
w = work done on the system = ?
n = number of moles of gas = 0.359 mole
R = gas constant = 8.314 J/mole K
T = temperature of gas = 298 K
= initial volume of gas = 3.42 L
= final volume of gas = 7.39 L
Now put all the given values in the above formula, we get :
Thus, the work done of path A is, -685.3 J
To calculate the work done for path B :
The formula used for isothermally irreversible expansion is :
where,
w = work done
= external pressure = 1.19 atm
= initial volume of gas = 3.42 L
= final volume of gas = 7.39 L
Now put all the given values in the above formula, we get :
Thus, the work done of path B is, -478.1 J
Suppose that scientists have discovered three new elements. All three elements are in the same group on the periodic table. The other known properties of the elements are given in the table.
Element symbol Atomic mass Physical state Boiling point
Xo 47 amu gas 215∘C
A 27 amu gas 350∘C
Zw 98 amu liquid 285∘C
The best order for the elements within the group, starting from the top and working down is ______ (Choices: Xo, Zw, A / A, Xo, Zw / Xo, A, Zw) because of the trend in the _______________. (Choices: Alphabetical order, boiling point, or atomic masses)
Due to the trend of boiling points, the optimal order for elements within a group going from top to bottom is \(A, X_o, Z_w\).
From the given information we can see that the boiling points of the elements decrease from A to Xo to Zw. The highest boiling point (350°C) is of element A, followed by Xo (215°C) and Zw (285°C). We arrange the components in decreasing order of boiling points to get A, Xo and Zw.
It is important to remember that in this situation, the alphabetical order of the elements and their atomic weights are irrelevant considerations. A reasonable basis for arranging the components within the system is provided by the trend in boiling points.
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What happens because of nuclear fusion?
A. Earth experiences cold temperatures neede to sustain life.
B. Plants are unable to produce their own food.
C. Animals receive too much heat and begin to die out.
D Earth is provided with heat and light energy needed to sustain life.
Answer:
d
Explanation:
How many moles of H2O are needed to produce 6.3 moles of H2
Answer:
H2 to O2
H2 to H2O
H20 to O2
H2O to H2
O2 to H20
O2 to H2
Explanation:
1A(s) + 2B(l) + heat ↔ 3C (g) + 4D (s)Predict the direction the reaction shifts if the following stresses are applied:‘D’ is removed
Answer: when product D is removed from the reaction, we should expect a shift of the reaction towards the product's side (shift to the right)
Explanation:
The question requires us to predict the change in the following reaction when the product D is removed:
1A(s) + 2B(l) + heat ↔ 3C (g) + 4D (s)
To solve this problem, we can apply Le Chatelier's principle, which states that changes in temperature, pressure, volume or concentration of reactants/products in a system will result in predictable changes in the system in order to achieve a new state of equilibrium.
According to the Le Chatelier's principle, if we increase the concentration of any reactant in the system, the equilibrium will shift towards the product's side (right shift) in order to consume the "excess" reactant added. In a similar way, if we decrease the concentration of a reactant in the system, the system tends to shift towards the reactant's side (left shift) in order to restabilish the equilibrium.
When we consider the changes in concentration of products we can say that adding more of a product in the system will shift the equilibrium to the reactant's side, while decreasing the concentration of a product will shift the equilibrium to the product's side.
Therefore, when product D is removed from the reaction, we should expect a shift of the reaction towards the product's side (shift to the right).
a student has a 1 L solution of 2 M HCL and wants to increase the HCL concentration to 3 M
The student needs to add approximately 83.3 mL of 12 M HCl solution to the existing 1 L of 2 M HCl solution to increase the concentration to 3 M. It is important to handle concentrated acids with caution and follow proper safety procedures.
To increase the concentration of a 1 L solution of 2 M HCl to 3 M, the student needs to calculate the volume of concentrated HCl needed and add it to the existing solution. Here's how the calculation can be done:
Given:
Initial concentration of HCl solution = 2 M
Final concentration desired = 3 M
Initial volume of HCl solution = 1 L
Step 1: Calculate the moles of HCl in the initial solution.
Moles of HCl = Initial concentration × Initial volume = 2 M × 1 L = 2 moles
Step 2: Calculate the moles of HCl needed for the desired concentration.
Moles of HCl needed = Final concentration × Final volume = 3 M × 1 L = 3 moles
Step 3: Calculate the moles of HCl to be added.
Moles of HCl to be added = Moles needed - Moles present = 3 moles - 2 moles = 1 mole
Step 4: Convert the moles of HCl to the required volume of concentrated HCl.
To calculate the volume, we need to know the concentration of the concentrated HCl solution. Assuming it is 12 M, we can use the following formula:
Volume of concentrated HCl = Moles of HCl to be added / Concentration of concentrated HCl
Volume of concentrated HCl = 1 mole / 12 M = 0.0833 L or 83.3 mL
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A 25 ml solution of 0.5 M NaOH is titrated until neutralized into a 50 ml sample of HCl?
The concentration of the acid is \(0.25 M\).
Titration is a laboratory technique used to determine the concentration of a substance in a solution by reacting it with a standardized solution of known concentration.
The titration formula can be given by,
(Volume of the Base) \(\times\) (Normality of the Base) = (Volume of the Acid) \(\times\) (Normality of the Acid)
\(\Rightarrow V_1N_1=V_2N_2\)
Given, the volume of the base (\(NaOH\)), \(V_1 =25 ml\).
The concentration of the base (\(NaOH\)), \(M_1=0.5 M\).
The equivalence of the base (\(NaOH\)) is \(1\).
Hence, the normality of the base (\(NaOH\)), \(N_1=\frac{0.5}{1}N=0.5N\).
Given, the volume of the acid (\(HCl\)), \(V_2 =50 ml\).
Let us assume that the normality of the acid (\(HCl\)) \(N_2\).
Substitute the values in the given formula of titration.
\((25\times0.5)=(50 \times N_2)\\\Rightarrow 12.5=50N_2\\\Rightarrow N_2=\frac{12.5}{50} N\\\Rightarrow N_2=0.25 N\)
Hence, the normality of the acid (\(HCl\)), \(N_2=0.25 N\).
The equivalence of the acid (\(HCl\)) is \(1\).
Therefore, the concentration of the acid, \(M_1=\frac{0.25}{1}=0.25 M\).
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Why is scientist Robert Hazen using pressure bombs to blow up minerals
Answer:
Hazen uses small metal cylinders called pressure bombs to blast minerals with insanely high pressures and temperatures. He's using that knowledge to figure out how ancient minerals might have been involved in the evolution of the first primitive life-forms.
Explanation:
One mole of any gas occupies 22.4 L under certain conditions of temperature and pressure. Assume those conditions for this question.
In a spacecraft, this reaction occurs:
CO2(g)+2LiOH(s)→CaCO3(s)+H2O(l)
How many liters of carbon dioxide will 2 moles of lithium hydroxide (LiOH) absorb?
Answer choices: A .3.0 L B .6.0 L C. 23 L D 45 L
State one (1) example of solute that. be dissolved by the solvent below... Turpentine,Kerosene, and Ethanol
Answer: Oil based dyes are best solutes which can be dissolved by Turpentine,Kerosene, and Ethanol like solvents.
Explanation:
This solvents helps to dissolve oil based dyes easily.
An organism that gets its energy from eating is called a(n) _
or
Given the reaction: Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
The reaction occurs more rapidly when a 10-gram sample of Mg is powdered rather than in one piece, because powdered
Mg has
1. less surface area
2. more surface area
3. a lower potential energy
4. a higher potential energy
How did the nucleus evolve through time?
Answer:
The nucleus represents a major evolutionary transition. As a consequence of separating translation from transcription many new functions arose, which likely contributed to the remarkable success of eukaryotic cells. Here we will consider what has recently emerged on the evolutionary histories of several key aspects of nuclear biology; the nuclear pore complex, the lamina, centrosomes and evidence for prokaryotic origins of relevant players.
write the structural formula for 2-bromo-3-chloro-4,4-dimethylpentanal
Answer:
Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO
Explanation:
The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.
The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.
The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.
The methyl groups are non-polar and do not have any significant reactivity.
The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.
The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.
What is the only way to confirm that a chemical change has taken place?
O A. You can observe a color change.
B. You can see that the mass of material has changed.
C. You can record a temperature change.
D. You can tell that a new substance has formed.
How are electricity and magnetism related?
Moving magnets can make electrical currents.
Electricity can create a magnetic field.
Electricity and magnetism are not related.
Protons and electrons are repelled by magnets.
Need help now this work is due by 5:00
Answer: Electricity and magnetism are essentially two aspects of the same thing, because a changing electric field creates a magnetic field, and a changing magnetic field creates an electric field.
Answer:How are electricity and magnetism related?
Moving magnets can make electrical currents.
Electricity and magnetism are not related.
Protons and electrons are repelled by magnets.How are electricity and magnetism related?
Moving magnets can make electrical currents.
Electricity and magnetism are not related.
Protons and electrons are repelled by magnets.How are electricity and magnetism related?
Moving magnets can make electrical currents.
Electricity and magnetism are not related.
Protons and electrons are repelled by magnets.
Explanation:
Consider a chemical species in which a carbon atom forms single bonds to three hydrogen atoms in which the carbon atom possesses no other valence electrons.
(a) What formal charge would the carbon atoms have?
(b) What shape would you expect this species to have?
(c) What is the hybridization of carbon atom?
The Formal charge is present on carbon which is +1. It has a triangular planer shape with sp2 hybridization- the concept of mixing two atomic orbitals to give rise to a new type of hybridized orbitals.
valence electron is an elementary particle in an atom's outer shell that really can take part in the development of a chemical bond if the outer layer is not shutdown. Both atoms inside a single covalent bond make a contribution each valence electron to create a shared pair. Valence electrons are ionic found in an organism's outermost shell. So because electrons in the outermost shells of two or more atoms are the first to come into contact with each other and decide how an atom might very well respond in a chemical process when two or more atoms interact. Numerous important molecules in your body, such as proteins, DNA, RNA, sugars, and fats, are composed of carbon atoms.
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