A coffee cup calorimeter is used to calculate the heat change when NH4Cl is dissolved in water. Use the data table below to calculate the heat change when 1.00 mole of NH4Cl is dissolved in water. (Assume that the heat change for the solution is the same as that of water alone and that you can ignore the mass of solid in the water, so use only the mass of water and the specific heat of water, 4.18 J/g °C, in calculating the heat change.)
Mass of NH4Cl = 5.03 g
Mass of water in the coffee cup = 60.0 g
Initial temperature of the water = 24.78 °C
Final temperature of the water = 19.23 °C
Is this process endothermic or exothermic?