Question

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

Answer 1

$C_2H_4+3O_2\to2CO_2+2H_2O.........-1411kJ$

$2CO_2+3H_2O\to C_2H_6+3\frac{1}{2}O_2..........+1560kJ$

$H_2+1/2O_2\to H_2O...........................-285.8kJ +$

$AH=-136.8kJ$