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delta H = (2. deltaH CO2 + deltaH H2O) - (deltaH C2H2)
= ((2.-393)+(-285)) - (84)
= -786 - 285 - 84
= -1155kJ
2)C2H6 + 7/2O2 ---> 2CO2 + 3H2O
delta H = ((2.deltaH CO2) + (3.deltaH H2O)) - (deltaH C2H6)
= ((2.-393) + (3.-285)) - (-226)
= -78 - 855 + 226
= -707 kJ
3) C2H5OH + 9/2O2 ---> 2CO2 + 6/2H2O
delta H = ((2. deltaH CO2) + (6. delta H2O) - (deltaH C2H5OH)
= ((2. -94)+(6.-68)) - (-66)
= -188 + (-408) + 66
= -596 + 66
= -530 kkal