Discussion
On complete combustion 0.12g of an organic compound gives 0.11g of CO2. What is the percentage of carbon in the organic compound?
Answer: C
The percentage of carbon is 25%.
Carbon is 12 parts in 44 of CO2, so the mass of carbon in 0.11 g of CO2 is
\[ \begin{aligned} m_{C} &= \frac{12}{44} \times 0.11 = 0.03\ \text{g} \\ \%C &= \frac{0.03}{0.12} \times 100 = 25\% \end{aligned} \]
Dividing 0.11 by 0.12 without converting to carbon would give over 90%, and the other values are arithmetic slips around the correct factor of \(\frac{12}{44}\).
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