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May I have some help with this particular problem?

At what temperature would CO2 molecules have an rms speed equal to that of H2 molecules at 25 degrees C?
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1 Answer

      The relationship is μ rms = (3RT/M)½

μrms = root mean square velocity in m/sec
R = ideal gas constant = 8.3145 (kg·m2/sec2)/K·mol
T = absolute temperature in Kelvin
M = mass of a mole of the gas in kilograms.
 All you have to do is calculate the speed for H2 at 25 deg C and then substitute the mass of a CO2 molecule and solve for the temperature.
Hope this helps