1.

The values of DeltaH for the combustion of ethene and ethyne are -341.1 and -310.0 kcal respectively. Which of the following is a better fuel

Answer»

`C_(2)H_(2)`
`C_(2)H_(4)`
Both of these
None of these

Solution :`DELTAH" for "C_(2)H_(4)=-341.1 K cal`
its calorific value = `(-341.1)/(28)=-12.1 KCAL//g`.
`DeltaH` for `C_(2)H_(2)` =-310.0 kcal
its Calorific value = `(-310.0)/(26)=-11.92`,
hence `C_(2)H_(2)` is a better FUEL.


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