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May 24, 2015

Homework Help: chemistry

Posted by sam on Wednesday, September 26, 2012 at 1:06pm.

KCl(s) → K+(aq) + Cl‾ (aq)

Solid KCl dissolves as shown in the above equation. A 6.60 g sample of KCl was dissolved in 42.3 g of water. The initial temperature of the water was 21.90C. After the compound dissolved, the temperature of the water was 10.20C. Assume the heat was completely absorbed from the water and no heat was absorbed by the reaction container or the surroundings. Calculate the heat of solution of KCl in kJ/mol. The specific heat of water is 4.184 J/gC. (Do not take the added mass of the KCl into account when calculating q for the solution.)

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