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Posted by on Tuesday, October 2, 2012 at 3:56am.

Write the balanced equation given that Mg(ClO3)2 decomposes into chloride and oxygen:

2Mg(ClO3)2 --> 2MgCl2 + 3O2

So if 0.302 grams of O2 is lost from 1.890 grams of a mixture of Mg(ClO3)2 and an inert material, what is the percentage of Mg(ClO3)2 in the mixture?

  • Chem. - , Tuesday, October 2, 2012 at 3:11pm

    moles O2 lost = 0.302g/molar mass O2 = about 0.009 (that's an estimate).
    Convert mols O2 to mols Mg(ClO3)2 with the coefficients.
    0.009 x (2 mol Mg(ClO3)2/3 mols O2) = 0.009 x 2/3 = about 0.006

    g Mg(ClO3)2 = mols x molar mass
    Then % Mg(ClO3)2 = [g Mg(ClO3)2/mass sample)*100 = ?

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