In a coffee cup calorimeter, 2.00 g of potassium hydroxide are mixed with 200.0 g of water at an initial temperature of 25.00C. After dissolving the salt, the final temperature of the solution is 27.33C. What is the heat change for the dissolution of potassium hydroxide in units of kJ per gram of potassium hydroxide. Assume the solution has a specific heat capacity identical to that of water.

Question

In a coffee cup calorimeter, 2.00 g of potassium hydroxide are mixed with 200.0 g of water at an initial temperature of 25.00C.  After dissolving the salt, the final temperature of the solution is 27.33C.  What is the heat change for the dissolution of potassium hydroxide in units of kJ per gram of potassium hydroxide. Assume the solution has a specific heat capacity identical to that of water.

Damon · Answer

heat generated = spec heat of water (202 grams)(27.33 - 25.00) divide by 1000 if that is in Joules to get kJoules divide by 2 grams to get kJ/gram