Solution of task 86 of Chemistry Book Shimanovich 2003

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86. The thermal effect of what reaction is equal to the heat of formation of NO? Calculate the heat of formation of NO, based on the following thermochemical equations:
4NH3 (g) + 5O2 (g) = 4NO (g) + 6 H2O (g); H = -1168.80 kJ.
4NH3 (g) + 3O2 (g) = 2N2 (g) + 6 H2O (g); H = 1530.28 kJ.

Answer: 90.37 kJ.

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