Kinetic Molecular Theory of Gases?

Question

What is the root mean square velocity of the PH3 molecule at 330 K?

What is the most probable velocity of the Xe atom at 309 K?

Answer 1

You can find the root mean square velocity (Vrms) of the molecules of a gas, using the formula:

Vrms = sqrt(3*R*T/M)

where R = 8.314 J/mol*K, T the absolute temperature (in Kelvin) and M the molar mass in Kg/mol (for example the molar mass of PH3 is 34*10^(-3) kg/mol)