Which one of the following gases contains the least number of molecules ?

Which one of the following gases contain the least number of molecukes ? (At Wt of P = 32, Cl = 35.5, N = 14, O = 16, C = 12, H = 1) .

Which of the following contains the least number of molecules ?

Which of the following contains the largest number of molecules?

Which of the following pair of gases contain the same number of molecules:

Which one of the following parts of gases contains the same number of molecules?

Which one of the following pairs of gases contain the same number of molecules?