A calorimeter contains 28.0 of water at 15. When 2.30 of (a substance with a molar mass of 81.

A calorimeter contains 28.0 of water at 15.0. When 2.30 of (a substance with a molar mass of 81.0 ) is added, it dissolves via the reactionand the temperature of the solution increases to 30.0.Calculate the enthalpy change, , for this reaction per mole of . Assume that the specific heat and density of the resulting solution are equal to those of water [4.18 and 1.00 ] and that no heat is lost to the calorimeter itself, nor to the surroundings.

 

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