Question

Enthalpies of formation of CO_(g), CO_2(g), N₂O_(g) and N₂O_4(g) are –110 kJ mol^–1, – 393 kJ mol^–1, 81 kJ mol^–1 and 9.7 kJ mol^–1 respectively. Find the value of Δ_rH for the reaction:

N₂O_4(g) + 3CO_(g) N₂O_(g) + 3CO_2(g)

Answer 1

Δ_rH for a reaction is defined as the difference between Δ_fH value of products and Δ_fH value of reactants.

For the given reaction,

N₂O_4(g) + 3CO_(g) N₂O_(g) + 3CO_2(g)

Substituting the values of Δ_fH for N₂O, CO₂, N₂O_4, and CO from the question, we get:

Hence, the value of Δ_rH for the reaction is.