Question

The number of unit cells in 58.5g of NaCl is nearly

• A. 6x10²⁰
• B. 3x10²²
• C. 1.5x10²³
• D. 0.5x10²⁴

Answer 1

The correct option is C 1.5x10²³

One mole of unit cell of NaCl = 4 $N{a}^{+}C{l}^{-}$ (based on unit particle per unit cell calculations)

$=4\times 58.5=234gm$

Therefore 58.5 gm will have 0.25 mole of unit cells.