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A chemist determined that a sample rusted piece of metal was 3.78g of Iron and 1.62g of Oxygen. What is the percent of each element in the sample?

1. 57.15% Fe & 42.85 % Ox
2. 65% 1 & 35% 0
3. 70% Fe & 30% 0
4. 91.2% Fe & 8.8% 0

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