A 1-L tank holds 1 g of hydrogen at 0°C and another 1-L tank holds 1 g of oxygen at 0°C. The mass of an oxygen molecule is 16 times the mass of a hydrogen molecule.

(a) Do the tanks hold the same number of molecules? If not, which holds more? 

(b) Do the gases exert the same pressure? If not, which exerts the greater pressure? 

(c) Do the molecules in the tanks have the same average energy? If not, in which are the average energies greater? 

(d) Do the molecules in the tanks have the same average speeds? If not, in which are the average speeds greater?