413. 1 kg of silica sol with SiO2 content of 30% wt. is located in the laboratory cylinder, forming a liquid column 340 mm high. Suppose, after sedimentation equilibrium was established at 18 ° C, half of the volume was carefully drained. What part of SiO2 will be in the merged half, if it is known that the diameter of the sol particles is 15 nm, and the densities of SiO2 and the dispersion medium are 2.20 and 1.01 g/cm3, respectively?

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