3grams of ammonium chloride has been added to 20mL of water. The initial temperature of the solutionis 18.0 degrees, and once the ammonium is added to the water, the temperature declines to 11 degrees. Given the following information, calculate the enthalpy of solution per mole of ammonium chloride, and explain why the solution is exothermic.
Givens: mass of cup= 1.74g
Mass of cup+water= 21.92g
Mass of cup+h20+NH4Cl= 24.88g
Specific heat capacity of NH4Cl=1.57

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