11. Express the composition of the resulting solution in terms of mass%, molality, molar concentration, molar fractions, molar concentration of the equivalent, if
90 ml of an aqueous solution of sodium carbonate (Na2CO3 anhydrous) with a composition of 0.254 mol/l and a density of 1.025 g/cm3 was mixed with 100 ml of an aqueous solution of Na2CO3 with a composition of 1.440 mol/l and a density of 1.140 g/cm3.

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