# Volume occupied by one molecule of water ( density = 1 gm $cm^{-3}$ ) is :
$\begin {array} {1 1} (1)\;5.5 \times 10^{-23}cm^3 & \quad (2)\;9.0 \times 10^{-23}cm^3 \\ (3)\;6.023 \times 10^{-23}cm^3 & \quad (4)\;3.0 \times 10^{-23}cm^3 \end {array}$