Dissolution Of Calcium Chloride Enthalpy How Do I Calculate The Temperature?

How do I calculate the temperature? - dissolution of calcium chloride enthalpy

The solution of calcium chloride in water;

CaCl2 (s) of Ca 2 + (aq) + 2Cl-(aq)

used in first aid kits. In these packages, an inner bag is broken with the salt, so that the salt is dissolved into the surrounding water.

A) El calculate the standard enthalpy change delta H ° for this reaction.
"I have calculated that-81 .4 kJ is

b) Suppose 20.0 g CaCl 2 dissolved in water to 0.100L of 20.0 ° C. Calculate the temperature of the solution, provided an ideal solution with a heat capacity close to 100 grams of pure water (418J / K).