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