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Homework Help: Determining the density of Silicon

  1. Oct 13, 2009 #1
    1. The problem statement, all variables and given/known data
    There are 8 atoms in a unit cell of Si. Silicon has an atomic weight of 28.09 and a lattice constant equal to 5.43 A. Determine the density of silicon/

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Oct 13, 2009 #2
    Figured it out.
    5.43 is in angstroms, which is 10^-8 cm.
    So density is atoms for cm^3

    so 8/(5.43x10^-8)^3 = 4.99x10^22/cm^3

    Simple as that.
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