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Q.
On complete combustion of $0.492\, g$ of an organic compound containing $C , H$ and $O$, $0.7938 \,g$ of $CO _2$ and $0.4428 \,g$ of $H _2 O$ was produced. The \% composition of oxygen in the compound is ___
JEE MainJEE Main 2022Some Basic Concepts of Chemistry
Solution:
$0.492\, g$ of $C _{ x } H _{ y } O _z$
Gives $0.7938 \, g \, CO _2=0.018$ moles
$0.4428\, g\, H _2 O =0.0246$ moles
So moles of $C =0.018 \Rightarrow 0.216\, g$
Moles of $H =0.049 \Rightarrow 0.049\, g$
$\therefore$ wt. of Oxygen $=0.492-0.216-0.049$
$=0.227\, g$
$\%$ of Oxygen $=\frac{0.227}{0.492} \times 10046$ (approx.)