41. Решение задачки по химии №5310

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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