consider separate 1Lsamples of He and UF6 both at 1 atm and containing the same number of moles. what ratio of temps for the two samples would produce the same root mean square velocity?

Answer 1

tempHe/tempUF6= rms 1/2 m vhe^2/1/2 m vUF6

ratiotemps = massHe/massUF6

Answer 2

rms velocity = sqrt(3RT/M) where M is the molar mass. Plug in R and M for each gas, set them equal to each other, and solve for the ratio of the Ts.