Enthalpy of vaporization of benzene is +35.3 | vedclass

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(B) The process is the condensation of benzene vapor to liquid,which is the reverse of vaporization. The enthalpy of condensation is $\Delta H_{	ext{

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(B) The process is the condensation of benzene vapor to liquid,which is the reverse of vaporization. The enthalpy of condensation is $\Delta H_{	ext{cond}} = -\Delta H_{	ext{vap}} = -35.3 \ kJ \ mol^{-1} = -35.3 	imes 10^{3} \ J \ mol^{-1}$. The boiling point is $T_b = 80 + 273 = 353 \ K$. The entropy change for the phase transition is given by $\Delta S = \frac{\Delta H_{	ext{cond}}}{T_b}$. $\Delta S = \frac{-35.3 	imes 10^{3} \ J \ mol^{-1}}{353 \ K} = -100 \ J \ K^{-1} \ mol^{-1}$.

Enthalpy of vaporization of benzene is $+35.3 \ kJ \ mol^{-1}$ at its boiling point,$80^{\circ} C$. The entropy change in the transition of the vapour to liquid at its boiling point in $[J \ K^{-1} \ mol^{-1}]$ is

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