Chemistry - Thermochemistry Question with Solution | TestHub

The relationship between enthalpy change (Δ H) and internal energy change (Δ E) is given by the equation:

Δ H = Δ E + Δ n_g RT

For Δ H to be equal to Δ E, the change in the number of moles of gas (Δ n_g) must be zero.

Let's calculate Δ n_g for each option:

(a) Δ n_g = +1

(b) Δ n_g = 2 - 2 = 0

(c) Δ n_g = 5 - 3 = +2

(d) Δ n_g = 1 - 2 = -1

Only option (b) has Δ n_g = 0.

Therefore, the answer is (b).