Q35 / 180 · KCET 2007 · Chemistry

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

  • A
    $2 \mathrm{~g}$ of carbon monoxide
  • B
    $2 \mathrm{~g}$ of carbon dioxide
  • C
    $2 \mathrm{~g}$ of sulphur dioxide
  • Correct answer
    D
    $2 \mathrm{~g}$ of water

Solution

Number of oxygen atom in $2 \mathrm{~g}$ of $\mathrm{CO}$ $$ =\frac{2}{28} \times 6.022 \times 10^{23} \times 1 $$ Number of oxygen atom in $2 \mathrm{~g}$ of $\mathrm{CO}_{2}$ $$ =\frac{2}{44} \times 6.022 \times 10^{23} \times 2 $$ Number of oxygen atom in $2 \mathrm{~g}$ of $\mathrm{SO}_{2}$ $$ =\frac{2}{64} \times 6.022 \times 10^{23} \times 2 $$ Number of oxygen atom in $2 \mathrm{~g}$ of $\mathrm{H}_{2} \mathrm{O}$ $$ =\frac{2}{18} \times 6.022 \times 10^{23} \times 1 $$ Hence, $2 \mathrm{~g}$ of $\mathrm{H}_{2} \mathrm{O}$ has maximum number of atoms of oxyen.

Hence, the correct answer is option: 'D'.

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