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In the manufacture of nitric acid by the oxi- dation of ammonia, the first product is nitric oxide. The nitric oxide is then oxidized to nitrogen dioxide:

2 NO(g) + O2(g) -→ 2 NO2(g)

Calculate the standard reaction enthalpy for the reaction above (as written) using the following data: N2(g) + O2(g) -→ 2 NO(g)

?H? = 180.5 kJ N2(g) + 2 O2(g) -→ 2 NO2(g)

?H? = 66.4 kJ

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