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The combustion of benzoic acid occurs ac...

The combustion of benzoic acid occurs according to expression
`C_(6)H_(5)COOH(s) + 7(1)/(2)O_(2)(g) hArr 7CO_(2) + 3H_(2)O (l)` in a bomb calorimeter at `25^(@)` C . If it liberates `Q_(v) "mol"^(-1)` , then `DeltaH` for reaction is

A

`-Q_(v)+(RT)^(1//2)`

B

`-Q_(v)+(RT)^(-1//2)`

C

`-Q_(v)+(1)/(2)RT`

D

`-Q_(v)-(1)/(2)RT`

Text Solution

Verified by Experts

The correct Answer is:
D
`DeltaH=DeltaE+DeltanRT`,
`Deltan` for reaction =7-7.5=-0.5
`DeltaH=-Q_(v)-(1)/(2)RT`
(In bomb calorimeter the reaction is done at a constant volume)
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