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Calculate the fuel efficiency in kJ/ gra...

Calculate the fuel efficiency in kJ/ gram of `C_(2)H_(4)` and `C_(4)H_(10)`. The heats of formation of `C_(2)H_(4), C_(4) H_(10), CO_(2)` and `H_(2)O` are 52.3, -126.1, -393.5 and -285.8 kJ `"mole"^(-1)` respectively.

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The correct Answer is:
`(50.39"and" 49.6 kJ g^(-1))`
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