GKFix MCQ Question

What is the enthalpy change for the reaction Na(g) + Cl(g) → NaCl(s)?

• A. +788 kJ mol⁻¹
• B. –788 kJ mol⁻¹
• C. +348.6 kJ mol⁻¹
• D. –348.6 kJ mol⁻¹