36. Solution to Chemistry Problem

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• For pure anthracene, the temperature dependences of the saturated vapor pressure at the liquid-vapor and crystal-vapor equilibrium are known.

Crystals-vapor T, K 418.9 450.4 471.7 482 490.7

P, Pa 133 854 2321 4914 5333

Liquid-vapor T, K 505.0 533.3 568.0 583.4 615.2

P, Pa 7990 17154 36315 53330 101320

At the triple point, the mass densities in the liquid and crystalline states are 948 and 954 kg/m3, respectively.

Find:

• Plot the graphs of the vapor pressure versus temperature P=f(T) and the graph of the lnP=(T) dependence

2 Determine the coordinates of the triple point.

З Calculate graphically the molar heats of evaporation and sublimation, assuming that they do not depend on temperature.

4 Determine the molar heat of fusion.

S Find the melting point of the substance Tm at p=8*107 Pa.

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