4. Solving a chemistry problem

4. Solving a chemistry problem

12. For substance A, the following are given: the heat of vaporization, the heat of sublimation, the density of the solid and liquid phases dtv, dzh at the triple point temperature Ttr.t. Based on these data: 1) calculate the boiling point of substance A using Trouton´s equation; 2) compose the equation IgPzh = a/T b (a and b are constants) for the equilibrium liquid ↔ vapor; 3) calculate the pressure of saturated vapor A at the triple point using the equation obtained; 4) make the equation lg Ptv = a’/T b’ for the equilibrium solid phase ↔ steam; 5) calculate dP/dT for solid ↔ liquid equilibrium; 6) plot the dependence of the equilibrium pressure on the phase transition temperature for three phase states in the pressure range from 0 to 1.013 * 105 Pa. In a given pressure range, the dependence of pressure on temperature for the equilibrium solid phase ↔ liquid phase is expressed by a straight line, i.e. dP/dT = const.

N Substance A T, K Heat of vaporization
10-4,
J/mol Heat of sublimation
10-4,
J/mol d-tv*10-3, kg/m3 d-l*10-3, kg/m3
12 Zn 692.6 12.84 12.84 6.914 6.920

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