Question

Calculate the heat of following reaction 

Na(s) + 0.5 Cl₂(g) → NaCl(s) ; ΔH° ? 

Given H₂(g) + Cl₂(g) → 2HCl,

ΔH° = −44 kcal

2Na(s) + 2HCl(g) → 2NaCl(s) + H₂(g),ΔH° = 152 kcal 

(a) 54 kcal 

(b) 98 kcal 

(c) 196 kcal 

(d) 108 kcal

Answer 1

Correct option (b) 98 kcal

Explanation:

Equation (i) can be obtained by adding eq. (ii) and (iii).