Empirical and molecular formulas from K, Mn, O percentages and molar mass 158

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westside
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Kinda help me this..when I am 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 because 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!
 
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At least show some attempt. You have to find the grams of each element. Start with that.
 

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