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Please Help with Chem Homework!!!!

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Solve the following calorimetry problem (show all work). A solid substance with a mass of 200g is at its melting point temp in a calorimeter. While the substance changes from a solid to a liquid at the same temp, the 400-g mass of water in the calorimeter goes from an initial temp of 80 C to a final temp of 30 C. A) How much heat did the water lose while the substance melted? B) What is the heat of fusion of the substance that melted?

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(A) about (50 K)(4.18 J/gK)(400 g) = 83.6 kJ. (B) (83.6 kJ)/(0.2 kg) = 418 kJ/kg.

            
        

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