\Delta_{vap}H^° for water is +40.49 kJ moi^-1 at 1 bar and 100°C . Change in internal energy for this vaporization under same condition is

Question

\(\Delta_{vap}H^°\) for water is +40.49 kJ \(mol^{-1}\) at 1 bar and 100°C . Change in internal energy for this vaporization under same condition is __________ kJ \(mol^{-1}\)

(Given \(R=8.3 JK^{-1}mol^{-1}\))

Answer 1

The enthalpy of vaporization \(\Delta _{vap}H^\circ\) is related to the internal energy change \(\Delta _{vap}U^\circ\) by the equation: