A compound has the formula $$ \text{Fe}_2\text{O}_3 $$ . The...

Question Analysis
This question tests the student's ability to calculate the percent composition of an element in a compound using the given atomic masses and the formula for percent composition.

Key Concept Explanation
Percent composition is calculated by dividing the total mass of the element in one mole of the compound by the molar mass of the compound, then multiplying by 100%.

Step-by-step Solution
1. Calculate the molar mass of :
Molar mass of Fe = 55.8 g/mol
Molar mass of O = 16.0 g/mol
Molar mass of = (2 × 55.8) + (3 × 16.0) = 111.6 + 48.0 = 159.6 g/mol
2. Calculate the total mass of iron in one mole of

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