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The difference between heats of reaction...

The difference between heats of reaction at constant pressure and constant volume for the reaction,
`2C_6H_6(l) + 15O_2(g) to 12CO_2(g) + 6H_2O (l)`
at `25^@C` in kJ is

A

`-3.5 kJ`

B

`+3.7 kJ`

C

`-7.4 kJ`

D

`+7.4 kJ`

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