Question

Use the set of three reactions shown below to answer the questions that follow.
2NO(g) + O2(g) → 2NO2(g)     ΔH = -116 kJ
2N2(g) + 5O2(g) + 2H2O(l) → 4HNO3(aq)     ΔH = -256 kJ
N2(g) + O2(g) → 2NO(g)     ΔH = +183 kJ

If 35.5 g of NO g is reacted with excess oxygen, how much heat energy is produced?

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