Question

For the reaction, H₂ + I₂ ⇌ 2HI; ΔH = 12.4 kcal. The heat of formation of HI, ΔH_f = ______.

Options

• 12.4 kJ

• 6 .2 kJ

• 25.9408 kJ

• 51.811 kJ

Answer 1

For the reaction, H₂ + I₂ ⇌ 2HI; ΔH = 12.4 kcal. The heat of formation of HI, ΔH_f = 25.9408 kJ.

Explanation:

H₂ + I₂ ⇌ 2HI; ΔH = 12.4 kcal

Formation of 2 molecules of HI, ΔH_f = 12.4 kcal.

∴ Formation of 1 molecule 1 of HI

ΔH_f = `12.4/2`

= 6.2 Kcal

= 6.2 × 4.184 kJ

= 25.9408 kJ