A calorimeter contains 27.0 mL of water at 13.0, ^{circ}C. When 1.30 g of rm X (a substance with a molar mass of 81.

A calorimeter contains 27.0 mL of water at 13.0, ^{circ}C. When 1.30 g of rm X (a substance with a molar mass of 81.0 g/mol) is added, it dissolves via the reactionrm X{(s)}+H_2O{(l)} rightarrow X{(aq)}and the temperature of the solution increases to 28.0, ^{circ}C.Calculate the enthalpy change, Delta H, for this reaction per mole of X.Assume that the specific heat and density of the resulting solution are equal to those of water [4.18 J/g and 1.00 g/mL and that no heat is lost to the calorimeter itself, nor to the surroundings.

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