Question

Consider the reaction

4NO₂ (g) + O₂ (g)→  2N₂ O₅ (g),  Δ_rH = 111kJ

if N₂O₅(s) is formed instead of N₂O₅(g) in the aboe reaction the Δ_rH value will be :–

(Given ΔH of sublimaton for N₂O₅ is 54 kJ mol^–1)

(a) – 165 kJ 

(b) +54 kJ

(c) +219 kJ 

(d) –219 kJ

Answer 1

Correct option (d) –219 kJ

Explanation:

Note, ΔH of sublimation of N₂O₅ (s) is + 54 kJ mol^–1.

Thus, for reverse process, it is –54 kJ mol–1.