If the volume occupied by a unit cell of NaCl is 4.7 × 10–23 ml, then the volume of a crystal of NaC

Question

If the volume occupied by a unit cell of NaCl is 4.7 × 10–23 ml, then the volume of a crystal of NaCl weighing 1.0 g is

Accepted Answer

21. Number of NaCl formula units in 1 gm = $\frac{1}{58.5} \times \left( 6 \times 10^{23} \right)$.

Each unit cell contains 4 NaCl formula units and hence, volume of crystal

$= \frac{6 \times 10^{23}}{58.5 \times 4} \times 4.7 \times 10^{- 23} = 0.12\text{ml}$

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