Chapter 14, Problem 48TE

There are five atoms in the methane molecule, ${\text{CH}}_{\text{4}}$. One out of these five is a carbon atom,

which is $\frac{1}{5}\times 100=20\%$ carbon. What is the percentage of carbon in ethane, ${\text{C}}_{\text{2}}{\text{H}}_{\text{6}}$? Propane ${\text{C}}_{\text{3}}{\text{H}}_{\text{8}}$? Butane, ${\text{C}}_{\text{4}}{\text{H}}_{\text{10}}$?