Question

Nitric oxide (NO) can be formed from nitrogen, hydrogen and oxygen in two steps. In the first step, nitrogen and hydrogen react to form ammonia:
N2(g)+3H(2)-->2NH3(g) H= -92. kJ

In the second step, ammonia and oxygen react to form nitric oxide and water:
4NH3(g)+5O2(g)-->4NO(g)+6H2O(g) H= -905. kJ

Calculate the net change in enthalpy for the formation of one mole of nitric oxide from nitrogen, hydrogen and oxygen from these reactions.
Round your answer to the nearest
.