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Homework Help: I dont get ithelp!

  1. Nov 25, 2006 #1
    Kinda help me this..when im in our class, our teacher discuss how to determine the empirical formula and the molecular formula of a compound having the given percentage composition and molar mass but i aint listen cuz i have headache.

    a) 24.68% K, 34.81% Mn, and 40.51% O;molar mass=158/mol

    and this please, finding the number of grams
    1.)62x10to the power of23formula units of Ca (MnO4)2

    please help me this and explain how did yo get it...

    -westy
    No Peace-out!
     
  2. jcsd
  3. Nov 27, 2006 #2
    At least show some attempt. You have to find the grams of each element. Start with that.
     
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