Place the following gases in order of increasing average velocity at 300 K: Ar,CH₄,N₂,and N₂O. A) Ar

Question

Place the following gases in order of increasing average velocity at 300 K: Ar,CH₄,N₂,and N₂O. A) Ar < CH₄ < N₂ < N₂O B) N₂O < Ar < N₂ < CH₄ C) N₂O < N₂ < CH₄ < Ar D) Ar < N₂ < N₂O < CH₄ E) CH₄ < N₂ < N₂O < Ar

Quizplus · Accepted Answer

The average velocity of a gas is inversely related to the square root of its molar mass. Therefore, the gas with the lowest molar mass will have the highest average velocity, and the gas with the highest molar mass will have the lowest average velocity. Given the gases are Ar (argon), CH4 (methane), N2 (nitrogen), and N2O (nitrous oxide), their molar masses increase in the order CH4 < N2 < Ar < N2O. Thus, the correct order from lowest to highest average velocity at 300 K is N2O < Ar < N2 < CH4.

Place the Following Gases in Order of Increasing Average Velocity