Answer to Question #75511 in Physical Chemistry for Jimmy

Question

To a beaker that contains 100 mL of water and is thermally insulated from its surroundings, 1.0 mol of solid calcium chloride is added. The solution is stirred, and the temperature of the solution changes from room temperature to a temperature that is greater than 30 oC. The temperature change is caused by heat energy?

a) absorbed from the surroundings into the solution.
b) evolved from the surroundings to the solution.
c) evolved in dissolving and hydrating the solid CaCl2.
d) absorbed in dissolving and hydrating the solid CaCl2.
e) of the hydrated ions being higher than the ions in the solid CaCl

Answer 1

Solution: CaCl2 + nH2O = CaCl2xnH2O + Q
Answer: c) evolved in dissolving and hydrating the solid CaCl2.