a.)The average molecular speed in a sample of O₃ gas at a certain temperature is 358 m/s.The average molecular speed in a sample of He gas is _____ m/s at the same temperature.

b.)The rate of effusion of gas through a porous barrier is observed to be 4.04 x 10^-4 mol/h. Under the same conditions, the rate of effusion of gas would be______ mol/h.