# What is the percent composition of carbon in acetic acid?

The percent composition of carbon in acetic acid is 40.002%.
Acetic acid: $\text{CH"_3"COOH}$
To determine the percent composition of carbon in acetic acid, divide the molar mass of acetic acid $\left(\text{60.052 g/mol}\right)$ by the mass of carbon $\left(\text{2"xx"12.011 g/mol}\right)$ in one mole of acetic acid and multiply by $100$.
(2xx12.011color(red)cancel(color(black)("g"))/color(red)cancel(color(black)("mol")))/(60.052color(red)cancel(color(black)("g"))/(color(red)cancel(color(black)("mol"))))xx100="40.002%"