Chemistry · THERMODYNAMICS

For electron gain by a gaseous atom, \( \text{X}(g) + e^- \rightarrow \text{X}^-(g) \), the electron affinity at \( 0\text{ K} \) is \( A = 345.0\text{ kJ mol}^{-1} \). What is the electron gain enthalpy \( \Delta_{eg} H^\ominus \) at \( 298.15\text{ K} \)? (Given \( \frac{5}{2}RT = 6.20\text{ kJ mol}^{-1} \))

1. A
   \( +351.20\text{ kJ mol}^{-1} \)
2. B
   \( -338.80\text{ kJ mol}^{-1} \)
3. C
   \( +338.80\text{ kJ mol}^{-1} \)
4. D
   \( -351.20\text{ kJ mol}^{-1} \)