Heat of Combustion Problems

1) Calculate the heat of combustion for C2H6 from the following information:
C2H4+3O2-> 2CO2+2H2O
C2H4+H2->C2H6
H2+1/2O2->H2O

2) Discuss the idea that the standard of living in society might be measured in units of kJ/person available in that society.

The unit itself is called energy in chemical reactions if that helps.

I attached the exact questions and they are 47 and 48 that need to be solved.

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... Calculate the heat of combustion for C2H6 from the following information:
C2H4+3O2 -> 2CO2+2H2O
C2H4+H2 ->C2H6
H2+1/2O2 ->H2O

To find the heat of combustion, you need to begin with a combustion reaction:

2 C2H6 + 7 O2 -> 6 H2O + 4 CO2

Now that you have the reaction, you need to build it out of the reactions given. If you reverse and double reaction 2, you will get two C2H6 as reactants:

2 C2H6 -> 2 H2 +2 C2H4 2 * 136.7 kJ = 273.4 kJ

Now you need to cancel out the C2H4. Doubling ...