When 4.50 g of this compound is added to 300.0 mL of water, the temperature rises from 18.3°C to 25.8°C. A Styrofoam cup calorimeter is used to calculate the heat of reaction for the dissolution of an ionic compound in water. Determine the heat of reaction (qrxn = ΔHrxn) per gram of compound (in kJ/g).