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Homework Help: Calculate the gram of iron

  1. Sep 8, 2009 #1
    1. The problem statement, all variables and given/known data
    Al(s) + Fe3 O4 = Fe (s) + Al2 O3(s)
    calculate how many grams of iron can be produced when 14.0g of Al are combined with excess FeO4.

    2. Relevant equations

    3. The attempt at a solution

    I know that I need to balance the solution which is:
    8Al(s) + 3Fe3 O4 = 9Fe (s) + 4Al2 O3(s)

    net/ionic eq

    8al + 3fe3o4 = 9fe + 4al2 o3

    can someone please help me on this I can't get any further on finding the excess on using the net or balance ionic equation. I cant really cancel any out that are the same on both side. please help.
  2. jcsd
  3. Sep 8, 2009 #2


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    Homework Helper
    Education Advisor
    Gold Member

    Start with the number of MOLES of Aluminum. Find the other necessary ratios from your balanced reaction.
  4. Sep 8, 2009 #3


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    Staff: Mentor

    There is no net ionic reaction here (it is not happening in the solution and neither of the substances is dissociated) and the one you have is properly balanced.

    Simple stoichiometry now - how many moles of Al? How many moles of iron produced per mole of Al?

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