The difference between the heats of reac...

The difference between the heats of reaction at constant pressure and a constant volume for the reaction `2C_6H_6(l)+15O_2(g)rarr12CO_2(g)+6H_2O(l)` at `25^@C` in kJ is

-7.43

`+3.72`

-3.72

`+7.43`

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