How many grams in 4.00 moles of Fe2O3?

Answer
4 Moles
Mass = 159.7 grams

4 X 159.7/1 = 6.388 or 6.39 grams.
How do you get 6.39X102grams?
Fe is +2 and O is –2. you have 2-Fe and 3-O why would this not be 6.39X10-2 grams

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