1. The problem statement, all variables and given/known data If the translationa speed of the water vapor molecules (H2O) in ir is 648 m/s, what is the translational rms speed of the carbon dioxide molecules in the same air? Both gases are at the same tmperature. 2. Relevant equations V^2 = (3kT)/m 3. The attempt at a solution I'm not even sure where to begin. I don't understand how knowing the water's speed helps me find the CO2's.