Calculate AH for the reaction: CHa (g) + H2 (g) ›CHa (g), from the following

data.

CHA (g) + 3 02 (g) ->2 CO2 (g) + 2 H20 (1)

AH=-1411. kJ

CHa (g) + 3½ Oz (g) ->2 COz (g) + 3 H20 (1)

AH=-1560, kJ

H2 (g) + ½ 02 (g) > H20 (1)

AH=-285.8 kJ