18. Solving a chemistry problem
275. Determine the number and total surface of particles formed during the crushing of a substance (table) and having a cubic or spherical surface.
№ ass Substance m, g 1 edge of the cube, cm d ball, cm Density
substances, g/cm3
275 Caffeine 2.5 1.5*10-6 1.0*10-6 1.23
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