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Question: Answered & Verified by Expert
If 0.2 gram of an organic compound containing carbon, hydrogen and oxygen on combustion, yielded 0.147 gram carbon dioxide and 0.12 gram water. What will be the content of oxygen in the substance?
ChemistrySome Basic Concepts of ChemistryBITSATBITSAT 2020
Options:
  • A $73.29 \%$
  • B $78.45 \%$
  • C $83.23 \%$
  • D $89.50 \%$
Solution:
1392 Upvotes Verified Answer
The correct answer is: $73.29 \%$
$\%$ of $\mathrm{C}=\frac{12}{44} \times \frac{0.147}{0.2} \times 100=20.045 \%$

$\%$ of $\mathrm{H}=\frac{2}{18} \times \frac{0.12}{0.2} \times 100=6.666 \%$

$\%$ of $\mathrm{O}=100-(20.045+6.666)=73.29 \%$

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