The dissociation of a salt in water to from an aqueous solution is called enthalpy of solution, δhsoln. the δhsoln for cacl2 is -120 kj/mol. when cacl2 is added to water a) the temperature of the water will increase. b) the temperature of the water will remain the same. c) the process is endothermic. d)nothing will occur, cacl2 is insoluble.

A) the temperature of the water will increase.

Explanation:

Consider, first, the dissolution of anhydrous calcium chloride, CaCl2 in water. CaCl2 is a very water soluble ionic compound that, in solution, dissociates into the component ions, Ca2 + and Cl-, which interact strongly with water molecules.

The thermochemical equation that represents the process of dissolution of CaCl2 (s) indicates that it is a strongly exothermic process:

CaCl2(s) --> Ca+2(aq) + 2Cl- (aq)   ΔH = -82.8 kJ

Therefore, dissolving CaCl2 in water will produce the release of energy in the form of heat (82.8 kJ per mole of dissolved CaCl2)

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