In a gas of different types of molecules all at the same temperature,the speeds of the heavier molecules will generally be _____________ the speeds of the lighter molecules.
A)the same as
B)greater than
C)less than
D)unrelated to

Question

Quizplus · Accepted Answer

The speeds of the heavier molecules will generally be less than the speeds of the lighter molecules because the root-mean-square speed of gas molecules is inversely proportional to their molecular weight. Heavier molecules have higher molecular weight and hence lower speeds than lighter molecules at the same temperature.

In a Gas of Different Types of Molecules All at the Same