6. The heat of reaction 3C2H2(g)=C6H6(l) under standard conditions is -630.8 kJ. Calculate the heat of this reaction at 75 C. The specific heat capacity of benzene is 1.745 J/(g*K), and the molar heat capacity of acetylene is 43.93 J/(mol*K). Consider the heat capacities to be independent of temperature in the range of 25-75 C.

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