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)

Number of oxygen atom in $2g$ of $CO$ $=\frac{2}{28}\times 6.022\times 10^{23}\times 1$
Number of oxygen atom in $2g$ of $C{O}_2$ $=\frac{2}{44}\times 6.022\times 10^{23}\times 2$
Number of oxygen atom in $2g$ of $S{O}_2$ $=\frac{2}{64}\times 6.022\times 10^{23}\times 2$
Number of oxygen atom in $2g$ of $H_{2}O$ $=\frac{2}{18}\times 6.022\times 10^{23}\times 1$
Hence, $2g$ of $H_{2}O$ has maximum number of atoms of oxygen.