Given that the standard molar enthapies of formation of $\mathrm{NO}(\mathrm{g})$ and $\mathrm{NO}_{2}(\mathrm{g})$ are, respectively, $90.3 \mathrm{kJ} \mathrm{mol}^{-1}$ and
(a)16.6 kJ
(b)–57.1 kJ
(c)–114.2 kJ
(d)57.1 kJ
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.