Question

What is the mass percent of carbon in ${\mathrm{CO}}_2$?

Answer 1

Step1.Calculation of molecular mass

${\text{Molecular mass of CO}}_{\text{2}}=1\times 12+2\times 16=44\text{g}$

Step2. Mass percentage of carbon in ${\mathrm{CO}}_2$

$44\text{g}$ of ${\mathrm{CO}}_2$ contain $\text{C}$= $12\text{g}$ atoms of carbon

% of $\mathrm{C}$ in ${\mathrm{CO}}_2$=$\frac{12\text{g}}{44\text{g}}\times 100=27.27\%$

Hence, the mass percent of the carbon in ${\mathrm{CO}}_2$ is $27.27\%$.