8.化學反應4NO(g)+2O2(g)→4NO2(g)的反應熱(kJ)為多少?
已知:N2(g)+O2(g)→2NO(g) ΔH°rxn=+183kJ
1/2N2(g)+O2(g)→NO2(g) ΔH°rxn=+33kJ (A)150 (B)–117 (C)–150 (D)–234