Question

Energy required to dissociate 4 gms of H${}_2$ (g) into free atoms is 208 K.cals at ${25}^0$ C. The H-H bond energy will be:

• A. 104 K.cals
• B. 1040 K.cals
• C. 10.4 K.cals
• D. 208 K.cals

Answer 1

The correct option is A 104 K.cals

$H_2\left(g\right)\to 2H$

moles of $H_2$= $\frac{4}{2}=2$

for 2 moles 208 K.cals energy
for 1 mole 104 K.cals energy is required to dissociate
$\therefore$ H - H band energy $=$ 104 k.cals

Option A is correct.