5. Estimate the critical sizes of nuclei of the solid phase of KCl and CaCl2 during their formation from supersaturated solutions with a concentration of 90 wt.%, if the concentration of their saturated solutions is 73.5 and 54.5 wt.%. The surface energy of solid crystals of KCl and CaCl2 is 110 and 450 mN/m, and their density is 1.98 and 2.51 g/cm3, respectively.

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