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131.Solving a chemistry problem

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22. A solution containing 0.001 g / cm3 of Fe2O3 is diluted 10,000 times. Ultra-microscopic calculation in diluted solution gave an average of 3
particles in the field of vision with a diameter of 0.04⋅10-3 m and a depth of 0.04⋅10-3 m. Assuming that the particles are spherical and that their density is 5.2 g / cm 3, find the particle diameter.
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