For a certain liquid

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

For a certain liquid, the molar enthalpy of vaporization is

+\!44\;\text{kJ mol}^{-1}

at its boiling point. Which of the following is the molar enthalpy change for the condensation of the vapor at the same temperature and pressure? (a)

+\!44\;\text{kJ mol}^{-1}

(b)

-\!44\;\text{kJ mol}^{-1}

(c)

-\!22\;\text{kJ mol}^{-1}

(d)

+\!22\;\text{kJ mol}^{-1}