The heat produce during combustion of 7....

The heat produce during combustion of 7.8 g `C_6 H_6` at constant volume forming `H_2 O_((l))` and `CO_(2(g))` is 40 kJ at `27^@C` . The heat of combustion at constant pressure is __________ .

`400 kJ mol^-1`

`-36.25 kJ mol^-1`

`43.74 kJ mol^-1`

`-403.74 kJ mol^-1`

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