55. Solution to Chemistry Problem

6. Based on the dependence of saturated vapor pressure on temperature and density of a given substance A (ds and df in kg/m3) at the triple point (tp):
1) plot a graph of lgP versus 1/T;
2) determine the coordinates of the triple point from the graph;
3) calculate the average heat of evaporation and sublimation;
4) plot a graph of saturated vapor pressure versus temperature;
5) determine the heat of fusion of the substance at the triple point temperature;
6) calculate dT/dp for the melting process at the triple point temperature;
7) calculate the melting point of the substance at a pressure p, Pa;
8) calculate the change in entropy, Gibbs and Helmholtz energy, enthalpy and internal energy for the sublimation process of 1 mole of the substance at the triple point;
9) determine the number of thermodynamic degrees of freedom at the following values ​​of temperature and pressure:
a) Ttr.t, ptr.t;
b) Tntk, p= 1.013 x 105 Pa;
c) Tntk, ptr.t

OPTION 6
State
Solid state
T, K 173 178 183 184 190
P, Pa 7330 11600 16795 19995 31192
Liquid state
T, K 190 196 200 207 215 221
P, Pa 31192 38657 46655 55986 69476 77314
Conditions
M=34
P=450*105 Pa
dsolid=1010
dliq=980