Chemistry · CHEMICAL BONDING AND MOLECULAR STRUCTURE

Given the ionization enthalpy of \( \text{Na(g)} \) is \( +495.8\text{ kJ mol}^{-1} \) and the electron gain enthalpy of \( \text{Cl(g)} \) is \( -348.7\text{ kJ mol}^{-1} \), calculate the net enthalpy change for the gaseous ion formation: \( \text{Na(g)} + \text{Cl(g)} \to \text{Na}^+(\text{g}) + \text{Cl}^-(\text{g}) \).

1. \( -147.1\text{ kJ mol}^{-1} \)
2. \( +147.1\text{ kJ mol}^{-1} \)
3. \( +844.5\text{ kJ mol}^{-1} \)
4. \( -788.0\text{ kJ mol}^{-1} \)