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Calculate the percent composition of the element (Show All Work)

Formula: Na2CO3
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1 Answer

I mole of Na2CO3 contains   2 moles Na,  3 moles O, and one mole of C.   In grams this is
2 *23 grams of Na, 3 * 16 grams of O and 12 grams of C
 
46 + 48 + 12 = 106 grams total.
percent Na = 46/106   =  43.4%
percent O   = 48/106   =  45.3%
Percent C   =  12/106   = 11.3%
 
Total                              100.0%