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 gas molecules is directly proportional to the square root of the temperature and inversely proportional to the square root of the molecular weight. Since all the gases have the same temperature and pressure, the one with the lowest molecular weight will have the highest average velocity. He has the lowest molecular weight among the given gases, so it has the highest average velocity.

Four Identical 1