Question

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 $N_{2}$

Answer 1

Answer: (A)

16 g of $O_{2}$and 14 g of $N_{2}$

Answer 2

16g $O_{2}$has no. of moles $= \frac{16}{32} = \frac{1}{2}$

14g $N_{2}$ has no. of moles $= \frac{14}{28} = \frac{1}{2}$

No. of moles are same, so no. of molecules are same.