Solution IV: Solution I + 5 moles of water. — Thermodynamics and Thermochemistry Chemistry Question

💡 Solution & Explanation

Solution I inherently contains 5 moles of water. Adding 5 more moles of water results in a final state equivalent to Solution II ($n=10$). The enthalpy of dilution is the difference between the states: $\Delta H_{\text{dilution}} = \Delta H_{10} - \Delta H_5 = -63.56\text{ kJ} - (-55.15\text{ kJ}) = -8.41\text{ kJ}$.