# A solid having density of

Question:

A solid having density of $9 \times 10^{3} \mathrm{~kg} \mathrm{~m}^{-3}$ forms face centred cubic crystals of edge length $200 \sqrt{2} \mathrm{pm}$. What is the molar mass of the solid?

(Avogadro constant $\cong 6 \times 10^{23} \mathrm{~mol}^{-1}, \pi \cong 3$ )

1. $0.0216 \mathrm{~kg} \mathrm{~mol}^{-1}$

2. $0.0305 \mathrm{~kg} \mathrm{~mol}^{-1}$

3. $0.4320 \mathrm{~kg} \mathrm{~mol}^{-1}$

4. $0.0432 \mathrm{~kg} \mathrm{~mol}^{-1}$

Correct Option: , 2

Solution:

$0.0305 \mathrm{~kg} \mathrm{~mol}^{-1}$