45. Решение задачи по химии №004 576

At a temperature T, the vapor pressure of a solution of concentration c, % of an unknown non-volatile substance in a liquid solvent is equal to P Pa; the density of this solution d. The dependence of saturated vapor pressure on temperature over a liquid and solid pure solvent is given in Table 1 (Appendix):
1) calculate the molecular weight of the solute;
2) determine the molar and molar concentrations of the solution;
3) calculate the osmotic pressure of the solution;
4) build a curve P - f (T) for a given solution and solvent;
5) determine graphically the temperature at which the vapor pressure over a pure solvent will be equal to R Pa;
6) determine graphically the increase in the boiling point at pressure P of a solution of a given concentration c;
7) calculate the ebullioscopic constant in all possible ways and compare these values with each other at normal boiling point (T n.t.c.)
8) determine the drop in freezing point
9) calculate the cryoscopic constant

Variant No. Mass content of non-volatile matter. % Molecular weight of the solvent R, Pa T. K d •10-3
kg/m3
12 6 64 7328 216 1.590

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