thermodyamics

The heat of solution of ammonium chloride is 15.2 KJ/mol. If a 6.134 sample of NH4Cl is added to 65.0 ml of water in a calorimeter at 24.5 C , what is the minimum temperature reached by the solution? (The specific heat of water of water = 4.18J/gC; the heat capacity of calorimeter = 365J/C) answer is 21.8C, how to set up this problem?