2.857 g of NH4Cl (53.19 g/mol) are added to 50.0 mL of water (18.02 g/mol, density = 1.00 g/mL) and the temperature changes from 22.30oC to 18.90oC.  Use this information to calculate the enthalpy change (kJ/mol) for the reaction illustrated in equation 6 of the laboratory procedure.  Use 4.18 J/(goC) as the specific heat of the solution. The equation is NH4Cl (s)  --> NH4Cl (aq)

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