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143. Solving a chemistry problem

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3.5. For the Al2O3 hydrosol, calculate the height at which the particle concentration decreases 2.7 times. The particle shape is spherical, the specific surface of the dispersed phase of the hydrosol: a) 109 m – 1;
b) 0.5 * 10 ^ 9 m – 1; c) 108 m – 1. The density of Al2O3 is 4 g / cm3, the density of the dispersion medium is 1 g / cm3, and the temperature is 293 K.
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