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Homework Help: Help on conversion with mass involved

  1. Aug 19, 2010 #1
    1. The problem statement, all variables and given/known data

    Grains of fine California beach sand are approximately spheres with an average radius of 45 µm and are made of silicon dioxide. A solid cube of silicon dioxide with a volume of 1.00 m3 has a mass of 2600 kg. 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 1.50 m on an edge?

    answer is in kg
    2. Relevant equations
    volume of sphere=4/3*pi*r^3

    3. The attempt at a solution
  2. jcsd
  3. Aug 20, 2010 #2


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    Homework Helper

    So what is the volume of 1 grain of sand?

    What is the density of the Silicon dioxide?

    What is the surface area of 1 sphere?
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