The change in enthalpy of vaporization is 27.4 kJ/mol that can be calculated using Clausius-Clapeyron relation.
The Clausius-Clapeyron relation is used to characterize a discontinuous phase transition between two phases of the same constituent such as ice. The plot is drawn between 1/T vs ln P.
T1= 25+273=298 K
P1=363 Torr
T2= 46.3+273 = 319.3 K
P2= 760 Torr which is the atmospheric pressure.
By using the Clausius-Clapeyron equation,
ln(P2/P1)=ΔH/R[1/T1-1/T2]
ln (760/363)=ΔH/8.314x10^-3[1/298-1/319.3]
ΔH=27.44 kJ/mol
Therefore, the change in enthalpy of vaporization is 27.4 kJ/mol.
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