36. Solution to Chemistry Problem

36. Solution to Chemistry Problem

6. 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:
1. 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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