In a rigid vessel, 17.60 moles of a substance at 27.4 degrees C is heated to 78.8 degrees C. Cv = 33.61 J.mol-1 C-1 Cp = 36.1 J.mol-1 C-1 If the vessel weighs 254 kg and has a heat capacity of 869 Jkg-1 C-1, How much heat(J) is required?

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