Question

Calculate the amount of energy required to convert $5$ mol of sodium atom in the gaseous state to form sodium ion. Ionization energy of $Na=5.1$ eV/atom.

• A. 2000 KJ
• B. 2455.6 KJ
• C. 3000 KJ
• D. 3455.6 KJ

Answer 1

The correct option is B 2455.6 KJ

Given $5$mol $Na\left(g\right)\to {Na}^{+}\left(g\right)+e^{-}$ , IE$=5.1$eV/atom

Atoms=$(5\times 6.023\times {10}^{23})$

$\therefore$ Total I.E=$(5.1\times 5\times 6.023\times {10}^{23}\times 1.6\times {10}^{-19}\times {10}^{-3})$KJ

$=2450$ KJ

$=2455.6$ KJ