93 Решение задачки по химии №09 398

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 the table:
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 •10-3kg/m3
8 7 46 2375 283.2 1.210

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