Use Hess's law to calculate H for the reaction below.?

Question

Consider the following data.

N2(g) + O2(g) 2 NO(g) H = +180.7 kJ
2 NO(g) + O2(g) 2 NO2(g) H = -113.1 kJ
2 N2O(g) 2 N2(g) + O2(g) H = -163.2 kJ

Use Hess's law to calculate H for the reaction below.

N2(g) + 2 O2(g) 2 NO2(g)
H = ____ kJ

Answer 1

N2(g) + O2(g) ==> 2 NO(g) H = +180.7 kJ........(1)
2 NO(g) + O2(g) ==> 2 NO2(g) H = -113.1 kJ...(2)
2 N2O(g) ==> 2 N2(g) + O2(g) H = -163.2 kJ....(3)

(1) + (2)
N2(g) + 2 O2(g) ==> 2 NO2(g)
H = _67.6_ kJ

Answer 2

least complicated wy to to it is the locate the values of the enthalpy's of formation of the compounds contained in the equation then used, products minus reactants, or you need to do an similar with a thermodynamic cycle even though it truly is slightly more suitable complicated.