If the unit cell length of sodium chloride crystal is 600 pm, then its density will be — Solid State Chemistry Question

💡 Solution & Explanation

For NaCl, $Z = 4$ and molar mass $M = 58.5 \text{ g/mol}$. Density $d = \frac{Z \times M}{N_A \times a^3} = \frac{4 \times 58.5}{6.022 \times 10^{23} \times (6 \times 10^{-8})^3} = \frac{234}{6.022 \times 21.6} \approx 1.79 \text{ g/cm}^3$. Therefore, correct answer is C.