Physics · JEE | THERMODYNAMICS

The heat capacity change \( \Delta_r C_p \) for a reaction at constant pressure is related to temperature dependence of reaction enthalpy via Kirchhoff's equation. For an ionization reaction, if \( C_p = \frac{5}{2}R \), the molar heat capacity contribution is:

1. A
   \( \frac{3}{2}R \)
2. B
   \( -\frac{5}{2}R \)
3. C
   \( \frac{5}{2}R \)
4. D
   \( -\frac{3}{2}R \)