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Heats of combustion of CH(4),C(2)H(6),C(...

Heats of combustion of `CH_(4),C_(2)H_(6),C_(2)H_(4) and C_(2)H_(2)` are -212.8,-373.0,-337.0 and -310.5 kcal respectively at the same temperature. The best fuel among these gases is:

A

`CH_(4)`

B

`C_(2)H_(6)`

C

`C_(2)H_(4)`

D

`C_(2)H_(2)`

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The correct Answer is:
A
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Heat of combustion of CH_(4),C_(2)H_(6), C_(2)H_(4) and C_(2)H_(2) gases are -212.8, -212.8, -373.0, -337.0 and -310.5 Kcal respectively at the same temperature. The best fuel among these gases is :

Heat of combustion of CH_(4),C_(2)H_(4),C_(2)H_(6) are -890,-1411 and -1560 kJ //mol respectively. Which has the lowest calorific fuel value ?

C_(2)H_(4),C_(4)H_(10), C_(3)H_(8),CH_(4)

DeltaH combustion for CH_(4),C_(2)H_(6) , and C_(3)H_(8) are -210.8,-368.4 and -526.3 kcal mol^(-1) , respectively. Calculate DeltaH combustion for octane.

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