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To answer this question we will have to know which of the many oxides of iron you are targeting.

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14y ago
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13y ago

(3 x 55.85)/(3 x 55.85 + 4 x 16)x100

=167.55/231.55 x 100

=72.4%

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7y ago

The percent by mass of oxygen in Fe2O3 is 30 %.

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13y ago

72%

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11y ago

72%

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11y ago

30

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Q: What is percent by mass of oxygen in Fe2O3?
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Related questions

Each molecule of iron oxide fe2o3 contains how many atoms of iron?

There are two atoms of iron and three atoms of oxygen in the compound Fe2O3. The mass percent of iron is 69.943%


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What is the percent of oxygen by mass in a pure sample of FeCr2O4?

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