At STP,as the molar mass of the molecules that make up a pure gas increases,the
A)root mean square speed of the molecules increases.
B)root mean square speed of the molecules decreases.
C)root mean square speed of the molecules remains constant.
D)root mean square speed increases to a maximum,then decreases.
E)none of the above.

Question

Quizplus · Accepted Answer

At STP, the root mean square speed of gas molecules is directly proportional to the square root of their temperature and inversely proportional to the square root of their molar mass. Therefore, as the molar mass of the gas molecules increases, the root mean square speed decreases.

At STP,as the Molar Mass of the Molecules That Make