Question

Number of molecules in one litre of water is equal to:

• A. $\frac{6.023}{23.4}\times {10}^{23}$
• B. $18\times 6.023\times {10}^{23}$
• C. $\frac{18}{22.4}\times {10}^{23}$
• D. $55.5\times 6.023\times {10}^{23}$

Answer 1

The correct option is D $55.5\times 6.023\times {10}^{23}$

1 litre of water $=1000$ g ( Since density of $H_{2}O=$ 1g/ml )

No. of moles $=\frac{1000}{18}=$ $55.55$

No. of molecules = $55.5\times 6.023\times {10}^{23}$

Hence, option D is correct.