In an investigation of thermophysicai p∆I’ erties of toluene (R.D Goodwin], phys. Chem. Ref Data 18, 1565 (1989)) pr.,-ented expressions for two coexistence curves (phase boundaries) the solid-liquid coexistence curve is given by plbar =pibar+ 1000 x (5.60 + 11.727x) x where x = ∆T} – 1 and the triple point pressure and temperature are P3 = 0.4362 ubar and T3 = 178.15 K. The liquid-vapour curve is given by: In (p/bar) = -1O.418/y + 21.157 – 15.996y + 14.015yz – 5.0120y3 + 4.7224(1- y) 1.70 where y = T/Te = TI (593.95 K).
(a) Plot the solid-liquid and liquid-vapour phase boundaries.
(b) Estimate the standard melting point of toluene.
(c) Estimate the standard boiling point of toluene.
(d) Compute the standard enthalpy of vaporization of toluene, given that the molar volumes of the liquid and vapour at the normal boiling point are 0.12 dm3 mol-l and 30.3 dm3 mol-1, respectively.
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