Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reaction: 2NO(g) + O2(g) → 2NO2(g).

ΔH°rxn = ?
Given:
N2(g) + O2(g) → 2NO(g), ΔH°rxn = 183 kJ
1/2N2(g) + O2(g) → NO2(g), ΔH°rxn = 33 kJ

a) -116 kJ
b) +116 kJ
c) -216 kJ
d) +216 kJ