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When 12.0g of carbon reacted with oxygen...

When `12.0g` of carbon reacted with oxygen to form `CO` and `CO_(2)` at `25^(@)C` and constant pressure, `75.0kcal` of heat was liberated and no carbon remained . Calculate the mass of oxygen which reacted.
`(DeltaH_(f)^(@)(CO_(2))=-95kcal mol^(-1),DeltaH_(f)^(@)(CO)=-24kcal mol^(-1))`

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The correct Answer is:
`27.49g;`
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