Although the molecules in a gas are moving about rapidly, a closed vessel of negligible weight containing the gas does not move.

According to the kinetic theory of gases,the molecules of a gas are identical and in random motion.The collisons made by these molecules on the walls of container exert pressure on the walls. For a gas gamma=3/2 and R is the universal gas constant,find the value of C_p and C_v .

Two vessels of the same size are at the same temperature.One of them contains 1 kg of hyrdogen (molecular weight 2 ) and the other contains 1 kg of nitrogen (molecular weight 28 ). Which of the vessels contains more molecules?