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Given C(s)+O(2(g))toCO(2(g)),DeltaH=-94....

Given `C_(s)+O_(2(g))toCO_(2(g)),DeltaH=-94.2K cal`
`H_(2(g))+½O_(2(g))toH_(2)O_((g)),Delta=-68.3K cal`
`CH_(4(g))+2O_(2(g))+2H=-210.8K cal`
what will be heat of gormation of ` CH_(4)` in (Kcal) ?

A

`+49.9`

B

`-20.0`

C

`+47.8`

D

`-47.3`

Text Solution

Verified by Experts

The correct Answer is:
B
`(1)+2xx(2)-(3)`
`DeltaH_(F)(CH_(4))=Delta_(1)+2DeltaH_(2)-DeltaH_(3)`
`=-94.2+2xx(-68.3)-(-210.8)`
`=-20KCal`
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