A copper calorimeter of mass of 70.5g contains 100g of water at 19.5°c, naphthalene (np) melting point is 79.9°c is melted in a test tube and then poured into the calorimeter. If the highest temperature reached by the water after stirring is 28.7°c and the final mass of the calorimeter and it’s content is 188.3g. Calculate the latent heat of fusion of naphthalene
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