A mixture of H 2 and He at 300 K effuses from a tiny hole in the vessel that contains it. What is the mole fraction of H 2 in the original gas mixture if 3.00 times as many He atoms as H 2 molecules...

A mixture of H₂
and He at 300 K effuses from a tiny hole
in the vessel that contains it. What is the mole fraction of
H₂
in the original gas mixture if 3.00 times as many He
atoms as H₂
molecules escape from the orifice in unit
time? If the same mixture is to be separated by a barrierdiffusion process, how many stages are necessary to
achieve H₂
of 99.9% purity?