Question

The volume occupied by one molecule of water (density $=1$ g/cc) is :

• A. $18$ cc
• B. $22400$ cc
• C. $6.023\times {10}^{-23}$ cc
• D. $3.0\times {10}^{-23}$ cc

Answer 1

The correct option is D $3.0\times {10}^{-23}$ cc

$1$ g of water occupies $1$ cc volume and contains $\frac{N_a}{18}$ molecules.

So, one molecule occupies $\frac{18}{N_a}=3.0\times {10}^{-23}$ cc, where $N_a$ is Avogadro's number.