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(a) Calculate the standard molar enthalpy change (deltaHrxn°) at 400 K (not 298 K) for the following reaction (the cyclotrimerization of ethyne to benzene), assuming that all heat capacities are independent of temperature: 3 C2H2(g) --> C6H6(g). (b) Calculate the standard molar entropy change (deltaSrxn) at 400 K for this same reaction.

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