Explain the molar mass of an unknown salt

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The molar mass of an unknown salt is 75.6. If 2.29 g is added to 71.2 mL of water the temperature changes from 20.70oC to 21.39oC. What is the molar heat of solution (J/mol) of the salt? (Assume all of the heat is transfered to the water) Express your answer to the nearest whole number (XXXX.).

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