Four identical 1.0-L flasks contain the gases He, Cl 2 , CH 4 , and NH 3 , each at 0°C and 1 atm pressure.
-For which gas do the molecules have the highest average velocity?

Question

Quizplus · Accepted Answer

The average velocity of a gas molecule is directly proportional to the square root of its temperature and inversely proportional to the square root of its molar mass. Since all of the gases are at the same temperature and pressure, the gas with the lowest molar mass, which is He, will have the highest average velocity.

Four Identical 1