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Mass problems

  1. Feb 5, 2008 #1
    I am having trouble with how to set up the equation for this problem....

    Os is the densest element known. Given that the density of Os is 22.57g/cm^3, calculate the mass, in kg, of an Os sphere 15 cm in diameter, which is about the size of a grapefruit.

    Any help would be greatly appreciated. I am really confused with where the diameter fits in... I feel so lost in this class! Yikes!
  2. jcsd
  3. Feb 5, 2008 #2
    You need to work on the basics:
    Volume of a sphere = 4/3( pi ) (radius cubed)
    Density = mass/volume
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