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Problem- A calorimeter contains 28.0mL of water at 15.0?C. When 1.90g of X (a substance with a molar mass of 58.0g/mol) is added, it dissolves via the reaction X(s)+H2O(l) - X(aq) and the temperature of the solution increases to 25.5?C Calculate the enthalpy change, ?H, for this reaction per mole of X. Assume that the specific heat of the resulting solution is equal to that of water [4.18 J/(g??C)], that density of water is 1.00 g/mL, and that no heat is lost to the calorimeter itself, nor to the surroundings.

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