Question 22N.1A.SL.TZ0.11

Gases in the atmosphere are compounds of ${}_6{}^{12}\text{C}$, ${}_1{}^1\text{H}$, ${}_8{}^{16}\text{O}$ and ${}_7{}^{14}\text{N}$.

Four of these gases are CO₂, N₂O, CH₄ and H₂O. A pure sample of each gas is produced. Each sample has the same mass.

Which sample contains the greatest number of molecules?

A.  N₂O

B.  H₂O

C.  CO₂

D.  CH₄