98. Solving a chemistry problem
5. 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 R 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 (pp. 167-170): 1) calculate the molecular weight of the dissolved substance; 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 (Tb.b.c.); 8) determine the decrease in the freezing point of the solution; 9) Calculate the cryoscopic constant.
Option Mass fraction of non-volatile substance, % Molar mass of solvent P,Pa T,K d .10-3 kg/m3
5 5 32 16106 306.7 1.590
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