A student dissolves 3.50 g of KNO₃ in 100.0 g of water initially at 24.00 °C. The calorimeter constant for the apparatus is 145 J °C⁻¹. After dissolution, the final temperature of the solution is 22.48 °C. Assume the solution’s specific heat capacity is 4.18 J g⁻¹ °C⁻¹ and the mass of the solution equals the mass of water. Determine the molar enthalpy of dissolution of KNO₃.