Using Two or More of the Following

Multiple Choice

Using two or more of the following,
N₂(g) +
O₂(g) → N₂O₃(s) ; ΔH° = 83.7 kJ
N₂(g) + O₂(g) → 2NO(g) ; ΔH° = 180.4 kJ
N₂(g) + O₂(g) → NO₂(g) ; ΔH° = 33.2 kJ
N₂(g) +
H₂(g) → NH₃(g) ; ΔH° = −45.9 kJ
Determine ΔH° for the following reaction.
NO(g) + NO₂(g) → N₂O₃(g)

A) -39.7 kJ
B) 24.3 kJ
C) -207.1 kJ
D) 39.7 kJ
E) 207.1 kJ