Example 2:
=
(i) N2(g) + O2(g) →NO [8] ∆H (kJ)
=+90
2[g]
(i) NO [g] +0[g] →NO 2[g] ∆H (kJ)
=-56
(ii) 2NO 2[g] →N₂04[g]
ΔΗ (kJ)=-58

Evaluate AH for the reaction (iv) N2tg +202 [g] → N₂O4[gl