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Which is a good fuel CH(4) orC(2)H(6) ? ...

Which is a good fuel `CH_(4)` or`C_(2)H_(6)` ?
The standard enthalpy of formation of `CH_(4), C_(2)H_(6), CO_(2)` and `H_(2)O` are `- 74.8, - 84.6 , - 393 . 5` and `-286kJ mol^(-1)` respectively.

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The correct Answer is:
`CH_(4)`
Calculate `Delta H ` for `CH_(4) + 2O_(2) rarr CO_(2)+ 2H_(2)O` and `C_(2)H_(6) + ( 7)/( 2) O_(2) rarr 2CO_(2) + 3H_(2)O`. Then calculate `Delta H` per gram
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