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Grains of fine California beach sand are approximately spheres with an average radius of 50 m and are made of silicon dioxide, which has a

Grains of fine California beach sand are approximately spheres with an average radius of 50 m and are made of silicon dioxide, which has a density of 2.6 103 kg/m3. What mass of sand grains would have a total surface area (the total area of all the individual spheres) equal to the surface area of a cube 0.8 m on an edge?

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