When 1.00 g of solid NH4Cl is dissolved in 25.00 g of water contained in a coffee cup calorimeter,

When 1.00 g of solid NH4Cl is dissolved in 25.00 g of water contained in a coffee cup calorimeter, both reagents initially being at 25.0°C, the temperature falls to 22.4°C. Assuming that the heat capacity of the ammonium chloride solution is 4.184 J/(g·K), calculate the heat (enthalpy) of solution of NH4Cl in J.