Which of the following gases has the highest average molecular velocity at 25 °C? H2O He
HCl
BrF
NO2

Answers

Answer 1

Answer:

Answer:

Step-by-step explanation:

A postulate of the Kinetic Molecular Theory is that at a given temperature, the average kinetic energy of the molecules is directly proportional to the Kelvin temperature.

KE = ½ mv² ∝ T

mv² ∝ T Divide each side by T

v² ∝ T/m

If T is constant.

v² ∝ 1/m Take the square root of each side

v ∝ 1/√m

This is an inverse relationship, so the molecules with the smallest molecular mass should have the highest average speeds.

A helium molecule has the smallest mass, so helium has the highest average molecular velocity.

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Consider this equilibrium:N2(g) + 3H2(g) 2NH3(g) + energy.

Certain conditions provide less than 10% yield of NH3 at equilibrium. Which statement describes this equilibrium?

Answers

This is the complete answer, including the set of answer choices:

Certain conditions provide less than 10% yield of NH3 at equilibrium. Which statement describes this equilibrium?

A. The Keq is large and products are favored.
B. The Keq is small and products are favored.
C. The Keq is large and reactants are favored.
D. The Keqis small and reactants are favored.
E. The conditions of the reaction must be known to answer the question

To answer you must know that the equilibrium yield is the quantity of product obtained.

In this case it is 10% of NH3.

That means that the equilibrium is more favorable to the reactants.

Given that Ke relates the concentration of products / concentration of reactants, the answer is the Ke is small and reactants are favored

Final answer:

This equilibrium has a low yield of NH3 and can be improved by adjusting the conditions and using the principles of Le Chatelier.

Explanation:

This equilibrium can be described as an equilibrium with a low yield of NH3. The fact that less than 10% yield of NH3 is obtained suggests that the forward reaction (N2(g) + 3H2(g) -> 2NH3(g) + energy) is not favored under the given conditions. To increase the yield of NH3, the conditions can be adjusted to shift the equilibrium towards the product side.

The Le Chatelier's principle can be applied to achieve a higher yield of NH3. One possible way is to increase the concentration of the reactants (N2 and H2) or decrease the concentration of the product (NH3). Another way is to increase the temperature, as this reaction is exothermic. By increasing the temperature, the equilibrium will shift in the reverse direction to consume the excess energy.

In summary, this equilibrium is characterized by a low yield of NH3, which can be improved by adjusting the conditions and using the principles of Le Chatelier.

Learn more about Equilibrium here:

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After doing multiple titrations, your NaOH solution is determined to have a mean concentration value of 0.100 M. Given you are to assume your unknown acid is 75.0% KHP, how many grams of your unknown will you need to use 15.00 mL of your 0.100 M standardized NaOH

Answers

Answer: The mass of unknown acid needed is 0.230 grams

Explanation:

To calculate the number of moles for given molarity, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

Molarity of NaOH solution = 0.100 M

Volume of solution = 15.00 mL = 0.015 L (Conversion factor: 1 L = 1000 mL)

Putting values in above equation, we get:

$0.100M=\frac{\text{Moles of NaOH}}{0.015L}\n\n\text{Moles of NaOH}=(0.100mol/L* 0.015L)=0.0015mol$

The chemical reaction for the reaction of KHP and NaOH follows

$KHC_8H_4O_4(aq.)+NaOH\rightarrow KNaC_8H_4O_4(aq.)+H_2O(l)$

By Stoichiometry of the reaction:

1 mole of NaOH reacts with 1 mole of KHP.

So, 0.0015 moles of NaOH will react with = $(1)/(1)* 0.0015=0.0015mol$ of KHP

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Moles of KHP = 0.0015 moles

Molar mass of KHP = 204.22 g/mol

Putting values in above equation, we get:

$0.0015mol=\frac{\text{Mass of KHP}}{204.22g/mol}\n\n\text{Mass of KHP}=(0.0015mol* 204.22g/mol)=0.306g$

We are given:

Mass of unknown acid = 75 % of Mass of KHP

So, mass of unknown acid = $(75)/(100)* 0.306=0.230g$

Hence, the mass of unknown acid needed is 0.230 grams

In a solution made by dissolving 50 grams of calcium chloride in 1000 grams of water, which component is considered to be the solute?

Answers

Calcium chloride is the solute because it was dissolved in water.
Therefore water is the solvent.

Solute is a particle which gets dissolved in a solution. It is usually smaller than solvent in quantity.

Solvent is a particle which dissolves Solute in a solution. It is usually larger than solute in quantity.

In your case above, Calcium chloride is in less quantity, and thus, Calcium chloride shall be called solute.

The element mercury was first discovered on the Sun.
a. True
b. False

Answers

This statement is FALSE. Mercury was not first discovered in the sun. In fact, mercury or quicksilver was discovered by ancient Indians and Chinese even before 2000 BC. Its ores that are called cinnabar are used in traditional Chinese medicines. However, the effectiveness is not yet justified because of the toxicity of the element. Mercury is also used with thermometers both in clinical and lab uses. Nowadays, the use of it in thermometers is gradually disappearing because of its harmful properties.

How does the hydrogen atom produce light

Answers

when energy is put into an atom, the electrons can use the energy to go to a higher energy state (n value) which is called an exited state. when the electron goes back down to where it started (called the ground state) it releases the energy it gained in the form of a photon which is why it produces light.
A common way to get hydrogen gas to produce light is by passing an electric current through the sample.

Why CH4 has a lower boiling point than CF4

Answers

Methane,CH4,has a lower boiling point than CF4 because it is a tetrahedral molecule with four equivalent C-H bonds. It's electronic structure is described by four bonding molecular orbitals (MOs) resulting from the overlap of the valence orbitals on C and H. The lowest energy MO is the result of the overlap of the 2s orbital on carbon with the in-phase combination of the 1s orbitals on the four hydrogen atoms.

It is a colorless, natural gas, and can breaks down atom creates CH3 with water vapor that Carbon tetrafluoride,CF4, don't have that has a high bond strength due to its nature of the carbon-fluorine bond and is a potent greenhouse gas.

CH4 has a lower boiling point than CF4 because it is a tetrahedral molecule with four equivalent C-H bonds.

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