What is the empirical formula of an oxide of iron with 69.9% iron and 30.1% oxygen by mass? - Some Basic Concepts of Chemistry Quiz | GKFix.in

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Question

What is the empirical formula of an oxide of iron with 69.9% iron and 30.1% oxygen by mass?

A. FeO
B. Fe₂O₃
C. FeO₂
D. Fe₃O₄