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On combustion carbon forms two oxides CO...

On combustion carbon forms two oxides CO and `CO_(2)`, heat of formation of `CO_(2)` is `-94.3kcal` and that of CO is -26. kcal. Heat of combustion of carbon is:

A

`-26.0` kcal

B

`-94.3` kcal

C

`-68.3` kcal

D

`-120.3` kcal

Text Solution

Verified by Experts

The correct Answer is:
B
Combustion reaction for C is: `C_((s))+O_(2(g))rarr CO_(2(g))`
Formation reaction of `CO_(2(g))" is : "C_((s))+O_(2(g)) rarr CO_(2(g))` Since Two reactions are same
`therefore Delta H_(c)" of "C and Delta H_(f)" of "CO_(2)` will be same.
`therefore Delta H_(c) =-94.3` kcal
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