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a- Calculate the heat, necessary to eliminated 200 g of liquid water from a container which has 400 g of ice at -10 C0.

b- Calculate the specific heat of an unknown material with mass equal to 65 g if during an experiment the unknown sample at 100 oC, was put into a calorimeter-water system at room temperature (24 oC) and the final temperature (unknown material, calorimeter and water ) after few minutes was 85 oF. (Consider the mass of the calorimeter equal to 20 g and the water 100 g and the specific heat of the calorimeter 0.9 J/g.C and the specific heat of the water 4.186 J/g.C).

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