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

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 :

A

`CH_(4)`

B

`C_(2)H_(6)`

C

`C_(2)H_(4)`

D

`C_(2)H_(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
Higher the calorific value, better is the fuel.
Calorific value `=(Delta H_("Comb."))/("Molecular weight")`
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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:

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The heats of combustion of C_(2)H_(4), C_(2)H_(6) and H_(2) gases are -1409.5 KJ, -1558.3 KJ and -285.6 KJ respectively. The heat of hydrogenation of ethene is

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.

ALLEN-THERMODYNAMICS -EXERCISE -3
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