For the combustion of 1 mole of liquid benzene at 25ºC, the heat of reaction at constant pressure is given by, C6H6(I) + 7 O2 (g) → 6 CO2 (g) + 3 H2O (I); ΔH = –780980 cal. What would be the heat of reaction at constant volume?
(A) –780090 cal
(B) –780890 cal
(C) –780000 cal
(D) –780900 cal