Fine grains of beach sand

Fine grains of beach sand are assumed to be spheres of radius 38.5 µm. These grains are made of silicon dioxide which has a density of2600 kg/m3. What is the mass of each grain of sand? Answer in units of kg

Consider a cube whose sides are 0.824 m long. How many kg of sand would it take for the total surface area of all the grains of sand to equal the surface area of the cube? Answer in units of kg

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