Which one of the following pairs of gases contains the same number of molecules?
- A$16 \ g$ of $O_2$ and $14 \ g$ of $N_2$
- B$8 \ g$ of $O_2$ and $22 \ g$ of $CO_2$
- C$28 \ g$ of $N_2$ and $22 \ g$ of $CO_2$
- D$32 \ g$ of $O_2$ and $32 \ g$ of $N_2$
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