OnlineCBT
Chemistry · THERMODYNAMICS
हिन्दीFor 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 \( \frac{5}{2}RT = 6.20\text{ kJ mol}^{-1} \))
Correct answer · Option 4
\( -351.20\text{ kJ mol}^{-1} \)
Explanation
\( \Delta_r C_p = -\frac{5}{2}R \), so \( \Delta_{eg} H^\ominus = -A - \frac{5}{2}RT = -345.0 - 6.20 = -351.20\text{ kJ mol}^{-1} \).
