Exactly equal amounts (in moles) of gas A and gas B are combined in a 1 L container at room temperature. Gas B has a molar mass that is twice that of gas A. Which of the following is true for the mixture of gases? Check all that apply.
a. The molecules of gas B have a greater average velocity than those of gas A.
b. Gas B has a greater partial pressure than gas A.
c. The molecules of gas B have greater kinetic energy than those of gas A.
d. Gas B makes a greater contribution to the average density of the mixture than gas A.

Question

09-12-2022
Chemistry

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Exactly equal amounts (in moles) of gas A and gas B are combined in a 1 L container at room temperature. Gas B has a molar mass that is twice that of gas A. Which of the following is true for the mixture of gases? Check all that apply.
a. The molecules of gas B have a greater average velocity than those of gas A.
b. Gas B has a greater partial pressure than gas A.
c. The molecules of gas B have greater kinetic energy than those of gas A.
d. Gas B makes a greater contribution to the average density of the mixture than gas A.

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Option D, Gas B indeed contributes more than gas A to the mixture's average density.

a. It is false to claim that the particles of gas B move at a faster average speed than those of gas A.

b. This claim is false since it implies that the saturation pressure of gas B is higher than that of gas A.

c. This claim is false since it implies that the particles of gas B have more kinetic energy than those of gas A.

d. This claim is accurate in that gas B contributes more than gas A to the mixture's average density. A gas mixture's density is determined by dividing its mass by its volume. The mass of the combination is the same as the combined masses of gas A and gas B. Both gases will have different masses since they have different molar masses but the same mole fraction.

The mass of gas B is equivalent to two-thirds of the mass of the gaseous phase, whereas the mass of gas A is equivalent to one-third of the weight of the gas mixture because gas B has a mass that is twice that of gas A. Gas B, therefore, makes a greater contribution to the gas mixture's density.

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