At what temp do hydrogen molecules, H2, have the same rms speed as nitrogen molecules, N2, at 455 C? At what temperature do hydrogen molecules have the same average kinetic energy?

Question

At what temp do hydrogen molecules, H2, have the same rms speed as nitrogen molecules, N2, at 455 C?  At what temperature do hydrogen molecules have the same average kinetic energy?

Celeste · Accepted Answer

So Tony’s wrong, the answer is most definitely not 455 C. You need to use the rms molecular speed equation, u=(3(RT)/Mm)^1/2. R=molar has constant, which is usually 8.31, T=temperature, and Mm= molar mass, but use kg/mol, instead of the normal g/mol. You can solve part A of the problem now by pluggin values in the find the rms speed of N2 at 455C which is about 805 m/s. Use that and plug it into the equation again, but leave T as the unknown value, and remember to switch the bottom mole mass value to H2, and you’ll get around 52 K for the answer. I don’t know how to solve part B either, so someone please help?

Tony · Answer

Dont worry bro i feel you the answer is 455C.