# Question 1c985

The formula for the percentage by mass of a chemical species $x$ is given by
$\underline{\overline{| \stackrel{\text{ ")(" "%"mass of"color(white)(l)x = ("mass of"color(white)(l)x)/"total mass" xx 100%" }}{|}}}$
For example, if you wanted to find the mass percentage of $\text{NaCl}$ given that there are $24$ $\text{g NaCl}$ in a solution with mass $131$ $\text{g}$, we would have
%"mass NaCl" = (24cancel("g NaCl"))/(131cancel("g soln")) xx 100% = color(blue)(ul(18.3%#