Question

The weight percentage of carbon in carbon dioxide and carbon disulphide is 27.27% and 15.79% respectively. What is the ratio of $S$ and $O$ that can combine with same weight of carbon?

• A. $2:1$
• B. $1:2$
• C. $1:1$
• D. $1:3$

Answer 1

The correct option is A $2:1$

In $C{O}_2$ 27.27% $C$ and 72.73% of $O$ is present
Weight of oxygen that combines with $1\text{g}$ of carbon = $\frac{72.73}{27.27}=2.67\text{g}$
In $C{S}_2$ 15.79% $C$ and 84.03% of $S$ is present
Weight of sulphur that combines with $1\text{g}$ of carbon $=\frac{84.21}{15.79}=5.33\text{g}$
Ratio of weights of $S$ and $O$ that can combine with same weight of carbon is $5.33:2.67=2:1$