How many moles of pcl3 contain 3. 68 × 1025 chlorine atoms?.
Answers
There are 6.131 × 10¹⁹ moles of PCl₃ that contain 3.68 × 10²⁵ chlorine atoms.
Let's consider the balanced equation of the reaction given below to determine the number of moles of PCl₃ that contain 1 mole of Cl atoms. PCl₃ + Cl₂ → PCl₅. Hence, 1 mole of PCl₃ contains 1 mole of Cl₂ and 3 moles of Cl atoms. Using the mole ratio obtained from the balanced chemical equation, we can calculate the number of moles of PCl₃ that contain 3.68 × 10²⁵ chlorine atoms.
As per the mole ratio, 3 moles of Cl atoms are present in 1 mole of PCl₃. Therefore, moles of PCl₃ = 3.68 × 10²⁵ / 3 = 1.227 × 10²⁵ moles of PCl₃.So, the number of moles of PCl₃ that contain 3.68 × 10²⁵ chlorine atoms is 6.131 × 10¹⁹ moles of PCl₃.
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Related Questions
which best describes nuclear energy?
A the energy that matter has due to the vibrations of its particles
B the energy an object has due to its chemical bonds
C the energy generated by a flow of electrons
D the energy stored inside the center of an atom
Answers
Answer:
The correct answer is - D. the energy stored inside the center of an atom.
Explanation:
Each atom has a small center in it called the nucleus and the energy that holds the nucleus or center of the atom together in the atom is known as nuclear energy.
It is the energy that is stored in the center of the atom and normally does not come out, however, in some radioactive atoms the sends some part of the energy as radiation.
Thus, the correct answer is - D. the energy stored inside the center of an atom.
23. A certain sample of nitrogen gas consists of 9.26 1022 nitrogen atoms.
(a) How many moles of N atoms are present in this sample ?
(b) If the gas is entirely in molecular form, how many molecules are present in this
sample?
(c) What is the mass of the sample in gramme?
Answers
Answer:
a) 0.154 moles of N2
b) 9.27 × 10^22 molecules
c) 4.312 g
Explanation:
a)
1 mole of N2 contains 6.02 × 10^23 atoms
x moles of N2 contains 9.26 × 10^22 atoms
x= 9.26 ×10^22/6.02 × 10^23
x= 1.54 ×10^-1
x= 0.154 moles of N2
b)
1 mole of N2 contains 6.02 × 10^23 molecules
0.154 moles of N2 contains 0.154 moles × 6.02 × 10^23 = 9.27 × 10^22 molecules
c)
Molar mass of the nitrogen gas= 28 gmol^-1
Number of moles of nitrogen gas = 0.154 moles
Number of moles = mass/molar mass
0.154 moles= mass/28 gmol^-1
Mass= 0.154 moles × 28gmol^-1
Mass= 4.312 g
Indicate the charge the following elements as they achieve the noble gas configuration.
Ga O Br P Rb As
S Mg Al Se Li I
Answers
Answer:
See explanation
Explanation:
Ga is in group 13 hence it must loose three electrons to form Ga^3+ in order to achieve the noble gas configuration because it has three electrons on its outermost shell.
O is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form O^2- since oxygen has six electrons on its outermost shell.
Br in group 17 has seven electrons in its outermost shell hence it must form Br^- (gain one electron) in order to attain the noble gas configuration.
P in group 15 must accept three electrons and form P^3- in order to attain the noble gas configuration since it has five electrons on its outermost shell.
S is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form S^2- since sulphur has six electrons on its outermost shell.
Mg in group 2 has two electrons on its outermost shell and must loose both to attain the noble gas configuration forming Mg^2+.
Al is in group 13 hence it must loose three electrons to form Al^3+ in order to achieve the noble gas configuration because it has three electrons on its outermost shell.
Se is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form Se^2- since selenium has six electrons on its outermost shell.
Lithium is in group 1 and must loose its only outermost electron in order to attain the noble gas configuration to form Li^+.
Rb is in group 1 and must loose its only outermost electron in order to attain the noble gas configuration to form Rb^+.
As in group 15 must accept three electrons and form As^3- in order to attain the noble gas configuration since it has five electrons on its outermost shell.
I in group 17 has seven electrons in its outermost shell hence it must form I^- (gain one electron) in order to attain the noble gas configuration.
A vehicle is traveling at a speed of 12.5ms-1. Express this speed in light year per year
Answers
A vehicle traveling at a speed of 12.5 m/s is equivalent to 4.171 x 10⁻⁸ light years per year.
What is the speed in light year per year?To convert a speed from meters per second to light years per year, we need to use conversion factors.
1 light year = 9.461 x 10¹⁵ meters
1 year = 31,536,000 seconds
So, to convert 12.5 m/s to light years per year using the conversion factor, 1 year = 31,536,000 seconds:
12.5 m/s = 12.5 x 31,536,000 m/year
12.5 m/s = 3.9468 x 10⁸ m/year
Now, we can convert meters per year to light years per year using the conversion factor 1 light year = 9.461 x 10^15 meters:
3.9468 x 10⁸ m/year = (3.9468 x 10^8 m/year) / (9.461 x 10^15 m/light year)
3.9468 x 10⁸ m/year = 4.171 x 10⁻⁸ light years per year
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Since NAD+ and NADP+ are essentially equivalent in their tendency to attract electrons, discuss how the two concentration ratios might be maintained inside cells at greatly differing values.
Check all that apply.
1.Because NAD+-dependent enzymes usually act to dehydrogenate (oxidize) substrates, an [NAD+]/[NADH] ratio greater than unity tends to drive reactions in that direction.
2.[NADP+]/[NADPH] ratio less than unity provide concentrations that tend to drive these reactions in the direction of substrate oxidation.
3. Because NADH-dependent enzymes usually act to hydrogenate (oxidize) substrates, an [NAD+]/[NADH] ratio greater than unity tends to drive reactions in that direction.
4. Because NAD+-dependent enzymes usually act to hydrogenate (reduce) substrates, an [NAD+]/[NADH] ratio greater than unity tends to drive reactions in that direction.
5. [NADP+]/[NADPH] ratio less than unity provide concentrations that tend to drive these reactions in the direction of substrate reduction.
6. [NADP+]/[NADPH] ratio less than unity provide concentrations that tend to drive these reactions in the direction of enzyme oxidation.
Answers
NAD+ and NADP+ are important coenzymes in cellular metabolism, involved in redox reactions and energy transfer. While they are equivalent in their tendency to attract electrons, their concentrations inside cells are greatly different. One possible explanation for this is their distinct roles in different metabolic pathways.
For instance, NAD+ is mainly involved in catabolic processes, such as glycolysis and the citric acid cycle, while NADP+ participates in anabolic processes, such as fatty acid and nucleotide synthesis. As a result, the concentration ratio of [NAD+]/[NADH] tends to be higher than unity, which favors substrate oxidation, while the [NADP+]/[NADPH] ratio is less than unity, which favors substrate reduction.
Another possible explanation is the regulation of enzymes involved in their synthesis and degradation. For example, the rate of NAD+ biosynthesis can be controlled by the availability of its precursors, such as nicotinamide and tryptophan. In addition, the degradation of NADH and NADPH can be regulated by enzymes such as alcohol dehydrogenase and glucose-6-phosphate dehydrogenase, respectively. Overall, the maintenance of NAD+ and NADP+ concentrations in cells involves a complex interplay of metabolic pathways and enzyme regulation, which is essential for cellular function and homeostasis.
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Which process in the nitrogen cycle turns dead plants and animals into ammonium?.
Answers
The process in the nitrogen cycle that turns dead plants and animals into ammonium is known as ammonification.
Ammonification is one of the significant steps in the nitrogen cycle. This process occurs when organic nitrogen is broken down into ammonium, which is also known as ammonia. During this process, dead plants and animals are converted into ammonium by decomposer microorganisms. These microorganisms produce enzymes that break down the nitrogen in organic matter, releasing ammonium as a result. The ammonium produced in this process is used by plants to create proteins, DNA, and other vital compounds.
Therefore, ammonification plays a critical role in the nitrogen cycle by converting organic nitrogen into ammonium, which is the primary source of nitrogen for plants. The ammonification process is also essential in breaking down complex organic matter into simple organic compounds that can be easily absorbed by plants.
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45.0 yard to kilometer
Answers
Answer:
0.0411 kilometre
Explanation:
1 yard = 0.0009144
Answer:
0.0411 kilometre
hope it helps :)
A pycnometer is a glass apparatus used for accurately determining the density of a liquid. When dry and empty, a certain pycnometer had a mass of 27.144 g. When filled with distilled water at 25.0°C, it weighed 36.377 g. When filled with chloroform (a liquid once used as an anesthetic before its toxic properties were known), the apparatus weighed 40.821 g. At 25.0°C, the density of water is 0.99704 g/mL
(a) What is the volume of the pycnometer?
Answers
The volume of pycnometer is 20.409 ml.
How is the volume of pycnometer determined?Volume of pycnometer is determined by using the general formula of density which is,
density=mass/volume
Considering the data given, mass of pycnometer =27.144 g
According to the standards , density of pycnometer at 25°C=1.33g/cm³
Substituting the values in the formula,
volume=mass /density=27.144/1.33=20.409 cm³
Pycnometer is an instrument which is used to measure the relative density of liquids and solids.The density of liquids is determined by using relative density and for solids the density is determined by weighing them.
It is based on Boyle's law which helps in determination of pressure-volume relationship. There are 2 types of this instrument ,one that which works on a basis of gas expansion and the other one which works on the basis of variable volume.
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Which of the following minerals scratches
fluorite mineral?
a. talc
b. diamond
c. gypsum
d. calcite
Answers
Answer:
b. diamond
Explanation:
Diamond is the hardest known naturally occurring substance. And it will scratch any other minerals below it on the moh's scale of hardness.
Fluorite is below diamond in the scale of hardness and it will readily scratch it. Talc, is the softest mineral, it will not scratch fluoriteBoth gypsum and calcite also below fluorite. They will not scratch this mineral.Pls help!! “write the following metals using Roman numeral notation. Then explain why the Roman numeral differs for these metals. •Cu1+ •CoCl2
Answers
Answer:
Cu1+ can be written as "Cu+" in Roman numeral notation.
CoCl2 can be written as "CoCl2" in Roman numeral notation.
Roman numeral notation is used to indicate the oxidation state of an element in a compound. The oxidation state is the charge an atom would have if all of the bonding electrons were assigned to the more electronegative atom. The + sign shows that Copper has lost an electron and now has a positive charge.
In the case of CoCl2, the Roman numeral notation is not used since cobalt does not have variable oxidation states and therefor it does not have any change in its charge to indicate.
What are some of the special strengths of molecular systematics? It allows study of relationships among very closely or very distantly related taxa, and it can often provide estimates of the time in years since taxa diverged.
Answers
Some special strengths of molecular systematics include its ability to study relationships among very closely or very distantly related taxa, and to provide estimates of the time in years since taxa diverged.
This helps researchers understand evolutionary connections and species' development over time.
Molecular systematics, also known as molecular phylogenetics, has several special strengths that make it a valuable tool for understanding the evolutionary relationships among organisms:
High resolving power: Molecular data can provide a much higher level of resolution in determining evolutionary relationships than traditional morphological data. This is particularly useful when studying closely related organisms that may have few distinguishing morphological features.
Wide taxonomic scope: Molecular systematics can be applied to a wide range of organisms, including those that are extinct or difficult to study using traditional morphological methods.
Independent of environmental factors: Molecular data is less subject to environmental influences than morphological data, which can be affected by factors such as diet, climate, and developmental stage.
Quantitative estimates: Molecular systematics can provide quantitative estimates of the time since two taxa diverged, as well as the degree of divergence between them.
Robustness to missing data: Molecular data is often more robust to missing data than morphological data, allowing for more accurate and comprehensive analyses.
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where would the largest jump in ionization energies be for oxygen (with the loss of how many electrons?)
Answers
The loss of the sixth e- will be followed by the biggest ionization jump. Because you are now attempting to remove the 2s2 electrons from a full valence shell, the 7th IE has the largest number.
What are ionization energy?The amount of energy needed to remove an electron from an isolated atom or molecule is known as ionization energy, also known as ionization potential, in chemistry and physics. The first (most loosely held) electron's associated ionization energy is the one that is most frequently used, though there is an ionization energy for each subsequent electron removed.
An electric discharge tube is typically used to measure the ionization energy of chemical elements, which is expressed in joules or electron volts. In this device, a fast-moving electron produced by an electric current collides with an element's gaseous atom, causing it to eject one of its electrons.
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Which statement describes chemical properties?
A. Characteristics that can change without changing the substance
B. Characteristics that can change when the state of the substance
changes
C. Characteristics that describe the ability of a substance to form a
new substance
D. Characteristics that describe what chemical a substance is made
up of
QQ
Answers
Answer:
D
Explanation:
A substance is made up of chemicals
Which of these is a benefit of fuel cell cars?
A. Fuel cell cars reduce the use of fossil fuels.
B. Hydrogen fuel is volatile.
C. Fuel cell cars are quickly recharged.
D. Hydrogen fuel is a limited resource.
Answers
Answer:
A.
Explanation:
There are no vehicle emissions other than water vapor. This means no pertroleum products and no fossil fuels. :)
-Sienna Sushi
equal volumes of 0.0300 m nh3 and 0.0150 m hcl are mixed together. what are the concentrations of nh3 and nh4 in the reaction?
Answers
The equal volumes of 0.0300 m nh3 and 0.0150 m hcl are mixed together the concentrations of nh3 and nh4 in the reaction are 0.0075 M .
Suppose the every identical quantity is V.
No. of moles of NH3 = 0.030 x V = 0.030VNo. of moles of HCl = 0.half x V = 0.015VThe 0.015V moles of NH3 are neutralized with 0.015V moles of HCl= No. of moles of NH4+ = 0.015V molesTotal quantity = V + V = 2VConcentration of ammonium, [NH4+] = No. of moles/ quantity= 0.015V/2V = 0.0075 M (Ans)Non-reacting no. of moles of NH3 = (Total No. of moles of NH3) – (No. of moles of NH4+)= 0.030V - 0.015V moles = 0.015V molesConcentration of ammonia, [NH3] = No. of moles/ quantity= 0.015V/2V = 0.0075 M.Read more about reaction:
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if i take 2 tables two times per day with 300 tables how many days will my prescription last
Answers
Answer:
150
Explanation:
300 divided by 2
what is temperature?
Answers
Answer:
a measure of hotness or coldness expressed in terms of a scale like Fahrenheit or Celcius
Imagine you used a 200.0 mL cylinder filled with 35.8mL of water. if you added a 125.0 g sample of this same metal, what would the total volume ( water+ metal) read on the cylinder? Shaw all work. (density =6.373g/mL)
Answers
Imagine you used a 200.0 mL cylinder filled with 35.8mL of water. if you added a 125.0 g sample of this same metal then the total volume would be 202.58 mL.
First, calculate the volume of the metal:
Volume = Mass / Density
Volume = 125.0 g / 6.373 g/mL
Volume = 19.78 mL
Now add the volume of the metal to the volume of the water:
Total Volume = 35.8 mL + 19.78 mL
Total Volume = 55.58 mL
Finally, add the volume of the metal and water to the volume of the cylinder:
Total Volume = 200.0 mL + 55.58 mL
Total Volume = 202.58 mL
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Steel has a density of 7.8 g/cm3. What is the volume of a 78-gram piece of steel?
Answers
Answer:
10 cm³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
\(volume = \frac{mass}{density} \\\)
From the question we have
\(volume = \frac{78}{7.8} \\ \)
We have the final answer as
10 cm³Hope this helps you
Directions: Using what you know about physical properties of matter, fill in the blanks below. When talking about physical properties of matter, a substance could change ____________________, but the substance is _______ changed into a new substance. In other words, the composition of matter is not changed. Physical properties are used to ________________ and ___________________ matter. Three examples of physical properties of matter are _______________________________________________.
Answers
When talking about physical properties of matter, a substance could change its state or form, but the substance is not changed into a new substance. In other words, the composition of matter is not changed. Physical properties are used to describe and classify matter. Three examples of physical properties of matter are density, color, and boiling point.
Physical properties of matter are characteristics that can be observed or measured without changing the substance into a new substance. These properties help us describe and classify different types of matter. When a substance undergoes a change in its physical state or form, such as melting, freezing, evaporating, or condensing, its physical properties can change, but the composition of the substance remains the same.
For example, when ice melts into liquid water, the state of the substance changes from solid to liquid, but it is still composed of the same water molecules. Similarly, when a substance changes its color or boiling point, it is still the same substance, just with different observable properties.
Three examples of physical properties of matter are:
Density: It is the mass per unit volume of a substance and describes how closely packed the particles are.Color: It refers to the visual appearance of a substance and is determined by the way it interacts with light.Boiling Point: It is the temperature at which a substance changes from a liquid to a gas phase and is dependent on the strength of intermolecular forces in the substance.To learn more about physical properties of matter, here
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Mosquitoes are responsible for transmitting the zika virus. In this case, the mosquitoes are
the disease.
asymptomatic transmitters.
biological vectors.
pathogens.
active carriers.
Answers
Answer:
active carriers
Explanation:
Mosquitoes are responsible for transmitting the zika virus. In this case, the mosquitoes are active carriers
Answer:
E -- active carriers
Explanation:
the mosquitos would be active carriers...
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describe the relationship between the substrate and the product
Answers
A simple chemical reaction with a single substrate shows a linear relationship between the rate of formation of product and the concentration of substrate, as shown below: ... The relationship between rate of reaction and concentration of substrate depends on the affinity of the enzyme for its substrate.
you have a solution with an unknown concentration of starch. your first measurement is out of range of the spectrophotometer. you dilute your sample 4-fold and your next measurement gives you an absorbance of 0.5. what is the concentration of the original sample? answers should not contain a decimal.
Answers
The concentration of starch in the original sample is 1 g/L.
What is the concentration of the original sample?The concentration of the original sample is determined as follows:
After diluting the sample 4-fold, the concentration of the starch = 1/4 of the original concentration.
The absorbance of the diluted sample is related to the absorbance of the original sample by the following equation:
A₁ = A₂x dilution factor
where;
A₁ is the absorbance of the original sample,A₂ is the absorbance of the diluted sample, andthe dilution factor is 4.Substituting the given values, we get:
A₁ = 0.5 x 4 = 2
Now we can use the Beer-Lambert Law to find the concentration of the original sample:
A = εbc
where
A is the absorbance,ε is the molar absorptivity,b is the path length, andc is the concentration.Since we do not know the value of ε or b, we will assume that they are constant and cancel out when we compare two measurements. Therefore:
A₁ / A₂ = c₁ / c₂
Substituting the given values, we get:
2 / 0.5 = c₁ / (c₂ x 4)
Solving for c₁:
c₁ = (2 / 0.5) x (1 / 4)
c₁ = 1 g/L
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At Christmas time, I like to burn scented candles that smell like sugar cookies. How does the candle in one location change the scent in an entire room or space? What is this called?
Answers
Answer:
its called diffusion
Explanation:
so the air is a substance and then it mixes with another substance which is the scent of the candle then the particles mix together to make a mixture
For the amino acid alanine, the major species in solution at ph 7 is the zwitterionic form, which has a negatively charged carboxylic acid group and a positively charged amino group. There is a less common neutral form in which neither group is charged. The carboxylic acid group of alanine has a pka of 3. The amino group of alanine has a pka of 8. Estimate the ratio of the concentration of the neutral amino acid species to the zwitterionic species at ph 7.
Answers
The ratio between the neutral and the zwitterionic form of alanine at pH 7 is 1:100000.
Since the carboxylic group has a pKa of 3, that means that at pH 3 the ratio between its protonated and deprotonated (charged) form is 1:1. The difference between pH 7 and pH 3 is 7 - 3 = 4, which means that (because pH is a negative logarithm), pH 7 is 10000 times more basic than pH 3. This implies that the ratio between the protonated and the deprotonated form of the carboxylic group is 1:10000.
A similar calculation can be applied to the amino group. 8 - 7 = 1, so at pH 7, the ratio between its protonated (charged) and deprotonated form will be 10:1.
We then multiply these two ratios to get a ratio of neutral:zwitterionic = 1:100000.
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Explain how Archimedes' principle determines the buoyant force on an object
in any fluid medium.
Answers
Answer:
An object in a fluid medium displaces a set amount of fluid upon immersion. Archimedes' principle states that the weight of the displaced fluid is equal to the buoyant force exerted on the object
An object in a fluid medium displaces a set amount of fluid upon immersion. Archimedes' principle states that the weight of the displaced fluid is equal to the buoyant force exerted on the object
what are the factors affecting concentrations of solution
Answers
Answer:
Reactant concentration. Increasing the concentration of one or more reactants will often increase the rate of reaction. ...
Physical state of the reactants and surface area. ...
Temperature. ...
Presence of a catalyst.
Could someone please help me
Answers
Answer:
Whistle 2 has a lower pitch, but is louder.
Whistle 3 has higher pitch and is less loud.
Explanation:
The more frequent the arches are the higher the pitch.
The larger the amplitude the louder the sound is.
;D
Truth or false old stream move slowly when they reach flat lands
Answers
I saw this on quizlet, hope this helps!
Which ion combines with ba2 to form a compound that is most soluble in water
Answers
Answer:
(2) OH- is the answer.
Explanation:
Hope this helps:)...if not then sorry for wasting your time and may God bless you:)
The ions that combine with Ba2 to form the compound most soluble in water is OH- ion.
What is barium?Barium is a chemical element with atomic number 58.
Barium reacts with the hydroxide ion to form barium hydroxide. It is also called baryta water.
The reaction is \(Ba^2^+ aq + 2OH^- \rightarrow Ba(OH)_2 (aq)\)
Thus, the ions that combine with Ba2 to form the compound most soluble in water is OH- ion.
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