Question

Which one of the following has maximum number of atoms of oxygen ?

• A. 2 g of water
• B. 2 g of sulphur dioxide
• C. 2 g of carbon dioxide
• D. 2 g of carbon monoxide

Answer 1

Answer: (A)

2 g of water

Answer 2

Number of oxygen atom in 2 g of ${CO}$
$= \frac{2}{28} \times 6.022 \times 10^{23} \times 1$

Number of oxygen atom in 2 g of ${CO_2}$
$= \frac{2}{44} \times 6.022 \times 10^{23} \times 2$

Number of oxygen atom in 2 g of ${SO_2}$
$= \frac{2}{64} \times 6.022 \times 10^{23} \times 2$

Number of oxygen atom in $2 \,g$ of $H_2O$
$= \frac{2}{18} \times 6.022 \times 10^{23} \times 1$

Hence, 2 g of ${H_2O}$ has maximum number of atoms of oxygen.