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28 September, 10:37

What is the percent by mass of oxygen in Fe2O3 (formula mass = 160) ?

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  1. 28 September, 11:01
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    Well the periodic table shows the molar mass of oxygen to be 16. Since there are 3 oxygen atoms in Fe2O3, multiply by 3.

    Then you would simply divide to find percent. 48/160 and then multiply by 100 to get percent.
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