12. A solution of substances A and B of a given concentration; the density of this solution at temperature T is equal to d: 1) determine the molar concentration - the number of moles of a solute in 1 liter of solution; 2) determine the molar concentration - the number of moles of a solute per 1 kg of solvent; 3) calculate the mole fraction of substance A in percent; 4) determine the number of moles of solvent per 1 mole of the solute.
N option Mass content Substance T,K d*10-3, kg/m3 A, % A B
12 80 C6H3(OH)3 H2O 293 1.208

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