Benzene(l) has a vapor pressure of 0.1269 bar at 298.15 K and an enthalpy of vaporization of

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Benzene(l) has a vapor pressure of 0.1269 bar at 298.15 K and an enthalpy of vaporization of 30.72 kJmol−1. The CP,m of the vapor and liquid phases at that temperature are 82.4 and 136.0 J K−1mol−1, respectively. Calculate the vapor pressure of C6H6(l) at 340.0 K assuming

a. That the enthalpy of vaporization does not change with temperature.

b. That the enthalpy of sublimation at temperature T can be calculated from the equation ΔH vaporization (T) = ΔH vaporization (T0) + ΔCP (T − T0) assuming that ΔCP does not change with temperature.

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Physical Chemistry

ISBN: 978-0321812001

3rd edition

Authors: Thomas Engel, Philip Reid

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