Estimate the entropy change of vaporization of benzene at 50°C. The vapor pressure of benzene is given by the equation: lnPsat/kPa = 13.8858 −2788.51/t /∘ C + 220.79 (a) Use Eq. (6.86) with an estimated value of ΔVlv. (b) Use the Clausius/Clapeyron equation of Ex. 6.6.
Estimate the entropy change of vaporization of benzene at 50°C. The vapor pressure of benzene is given by the equation:
lnPsat/kPa = 13.8858 −2788.51/t /∘ C + 220.79
(a) Use Eq. (6.86) with an estimated value of ΔVlv.
(b) Use the Clausius/Clapeyron equation of Ex. 6.6.
Write the equation 6.72 as follows:
…… (1)
Here, 
is change in entropy between liquid and vapor, 
is change in volume of benzene between liquid and vapor phases, 
is temperature, and 
is saturated pressure.
Write the vapor pressure equation as follows:
…… (2)
Here, 
is the saturated pressure and 
is temperature.
Temperature of benzene 
is 
.
Substitute 
for t in equation (2) to calculate the saturated pressure.
Hence the pressure of the benzene is 
.
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