Benzene Heat of Combustion

The heat of combustion of benzene at 27° C found by bomb calorimeter .i.e, for the reaction
C₆H₆_(l) + 15/2 O₂_(l)→ 6CO ₂_(g) + 3H ₂O_(l)
is 780kcal mol⁻¹. The heat evolved on burning 39 g of benzene in an open vessel will be

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