2NO₂ + 4H₂ -> N₂ + 2H₂O
ΔHh-h = 436 kJ
ΔHn-o =210 kJ
ΔHn=o = 631 kJ
ΔHn=- n = 947 kJ
ΔHo-h = 465 kJ
ΔHx = 2(210kJ) + 2(631kJ) + 4(436kJ) - 947kJ -2(465kJ) = 410kJ + 1 262kJ + 1 744kJ - 947kJ - 930kJ = 3 416 - 1 877 = 1 539kJ
