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Homework Help: Calculating the number of atoms in X Kilograms of iron

  1. Oct 29, 2011 #1
    1. The problem statement, all variables and given/known data

    I'm having trouble with this. I need to calculate the number of atoms in iron. How do I do this? For example if I had 1 KG of iron, how many atoms are in it?

    2. Relevant equations

    I need to give an answer in scientific notation
    A x 10^B
    A being 1 significant figure, and B being whole number

    3. The attempt at a solution

    No idea what to do.
  2. jcsd
  3. Oct 29, 2011 #2
    Try using the Avogadro constant.
  4. Oct 29, 2011 #3
    Whats that?
  5. Oct 29, 2011 #4
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