Arrange the following gases in order of increasing average molecular speed at 25 °C. He,O₂,CO₂,N₂ A)He

Question

Arrange the following gases in order of increasing average molecular speed at 25 °C. He,O₂,CO₂,N₂ A)He < N₂ < O₂ < CO₂ B)He < O₂ < N₂ < CO₂ C)CO₂ < O₂ < N₂ < He D)CO₂ < N₂ < O₂ < He E)CO₂ < He < N₂ < O₂

Quizplus · Accepted Answer

The average molecular speed of a gas is inversely proportional to the square root of its molar mass. Therefore, lighter gases move faster. The order from heaviest to lightest is CO2, O2, N2, He, so the order of increasing speed is CO2 < O2 < N2 < He.

Arrange the Following Gases in Order of Increasing Average Molecular