Chemistry 30

Given the following equations:

4 NH_{3 (g)} + 5 O_{2 (g)} → 4 NO _(g) + 6 H₂O _(l)   ΔH° = -1170 kJ

4 NH_{3 (g)} + 3 O_{2 (g)} → 2 N_{2 (g)} + 6 H₂O _(l)   ΔH° = -1530 kJ

Using these two equations, determine the heat of formation,  ΔH_f°, nitrogen monoxide, NO.

Hint: Use your mouse to highlight the following line of text to see the heat of formation reaction:

½N₂ + ½O₂ → NO