OnlineCBT
Chemistry · Some Basic Concepts of Chemistry
हिन्दीDetermine the empirical formula of an oxide of iron which has \( 69.9\% \) iron and \( 30.1\% \) oxygen by mass.
Correct answer · Option B
\( \text{Fe}_2\text{O}_3 \)
Explanation
Moles of Fe = \( \frac{69.9}{55.85} = 1.25 \), Moles of O = \( \frac{30.1}{16} = 1.88 \). Ratio Fe:O = \( 1:1.5 = 2:3 \), hence \( \text{Fe}_2\text{O}_3 \).
