41. Solution to Chemistry Problem
1. At 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 is d. The dependence of the saturated vapor pressure on the temperature above a liquid and solid pure solvent is given in the table (pp. 167-170): 1) calculate the molecular mass of the dissolved substance; 2) determine the molar and molal concentrations of the solution; 3) calculate the osmotic pressure of the solution; 4) plot the curve P = f(T) for the given solution and solvent; 5) determine graphically the temperature at which the vapor pressure above the pure solvent will be equal to P Pa; 6) determine graphically the increase in 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 (Tn.t.c.). 8) determine the decrease in the freezing point of the solution; 9) calculate the cryoscopic constant.
Option No. Mass content of non-volatile substance. % Molecular mass of solvent P, Pa T. K d •10-3
kg/m3
1 0.5 18 1598 288.2 1.000
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