a calorimeter contains 290 grams of waterh2o at, Chemistry

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a calorimeter contains 290 grams of waterh2o at

A calorimeter contains 29.0 grams of water(H2O) at 11.5 degree Celsius temperature . When 1.90 grams of a substance (with a molar mass of 81.0 ) is added, it dissolves via the reaction and the temperature of the solution rises to twenty eight degree celsius. compute the enthalpy change for this reaction per mole of this substance?.

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