Question

On complete combustion, $0.246 g$ of an organic compound gave $0.198 g$ of carbon dioxide and $0.101 g$ of water. Determine the percentage composition of carbon and hydrogen in the compound:

• A. $8.9 \%$(H) $4.58 \%$ (C)
• B. $6.8 \%$ (C) $4.58 \%$ (H)
• C. $4.58 \%$ (H) $21.95 \%$ (C)
• D. $3.2 \%$(H) $21.95 \%$ (C)

Answer 1

Answer: (C)

$\%$ of carbon $=\frac{12 \times 0.198 \times 100}{44 \times 0.246}=21.95 \%$

$\%$ of hydrogen $=\frac{2 \times 0.1014 \times 100}{18 \times 0.246}=4.58 \%$