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A calorimeter contains 25.0 of water at 14. When 1.80 of (a substance with a molar mass of 82.

A calorimeter contains 25.0 of water at 14.0. When 1.80 of (a substance with a molar mass of 82.0 ) is added, it dissolves via the reaction
x(s)+h2o(l)=x(aq)

and the temperature of the solution increases to 29.0.
Calculate the enthalpy change, , 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 and 1.00 ] and that no heat is lost to the calorimeter itself, nor to the surroundings.

This question was asked on Apr 23, 2010.

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