41. Solution to Chemistry Problem

Product description

• Based on the dependence of saturated vapor pressure on temperature and density of a given substance A with molecular weight M in the solid and liquid states (ds and dl in kg/m3) at the triple point (tp):

• plot a graph of saturated vapor pressure on temperature, indicate the sublimation line, melting line, and evaporation line;
• plot a graph of ln P on 1/T;
• determine the coordinates of the triple point from the graph;
• calculate the average heat of evaporation and sublimation;
• determine the heat of fusion of the substance at the triple point temperature;
• calculate dT/dP for the melting process at the triple point temperature;
• calculate the melting point of the substance at a pressure of P Pa;
• Calculate the change in entropy, Gibbs and Helmholtz energies, enthalpy and internal energy for the process of sublimation of 1 mole of a substance at the triple point;
• Determine the number of thermodynamic degrees of freedom at the following values ​​of temperature and pressure: a) Ttr.t, Ptr.t; b) Tn.t.k, P = 1 atm; c) Tn.t.k, Ptr.t. (n.t.k is the normal boiling point). Take the data required for the calculation from the table. № var 5

Solid state

T, K 229.2 248.0 257.0 267.0 273.2

P, Pa 133.3 694.5 1333 2966 4786

Liquid state

T, K 273.2 282.5 298.2 306.7 312.5 316.5

P, Pa 4786 6665 12697 16396 18929 21328

Conditions M=32 P=300*105 Pa

dsolid=837/m3

dliq=825 kg/m3

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