Acompound is 69.9% iron and 30.1% oxygen by mass. how much iron could by obtained from 5.41 grams of the compound?

3.78 g

Explanation:

The percent composition by mass of the compound is 69.9% iron and 30.1% oxygen. This means that every 100 g of the compound there are 69.9 g of iron and 30.1 g of oxygen. We will use this ratio to find out how  much iron could be obtained from 5.41 g of the compound.

5.41 g compound × (69.9 g Fe / 100 g compound) = 3.78 g Fe

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