chem

over the years, the thermite reaction has been used for welding railorad rails, in incendiary bombs, and to ignite solid fuel rocket motors. The reaction:
Fe2O3(s) + 2 Al (s) -> 2 Fe(l) + Al2O3 (s)
What masses of iron ( III) oxide and aluminum must be used to produce 15.0 grams of iron? What is the maximum mass of aluminum oxide that could be produced?

asked by greeny
  1. 15g of Fe is 15/55.845 = 0.2686 moles

    Each mole of Fe requires 1 mole of Fe2O3 and 2 moles of Al.

    mol wt Fe2O3 = 2*55.845+3*15.999 = 159.687
    mol wt Al = 26.982
    so, we need
    .2686*159.687 = 42.9g Fe2O3
    .2686*2*26.982 = 14.5g Al

    mol wt Al2O3 = 2*26.982+3*15.999 = 101.961
    so, we get .2686*101.961 = 68.9g Al2O3

    posted by Steve
  2. We first check if the equation is balanced and according to our equation its already balanced.2nd we find the ratios from the equation.
    FeO3+2AL=2Fe+AL2O3
    2 = :2
    x = :mass over
    rmm=the answer you u will find when u do mol=mass/rmm.
    Then n=mass/molar mass
    Mass=mol x rmm
    mass=0.134 x 159.6
    21.359.final

    posted by C'm mulerk

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