Which of the following expressions gives the mass percent of component X in a mixture?

MATHEMATICS · Single correct · AoPS · Mathematics · Ratios and Percents · Basic Ratio Problems

Problem

Which of the following expressions gives the mass percent of component X in a mixture? (a)

\dfrac{n_{X}}{n_{\text{total}}}\times 100\%

(b)

\dfrac{\text{total mass of mixture}}{\text{mass of X}}\times 100\%

(c)

\dfrac{\text{mass of X}}{\text{total mass of mixture}}\times 100\%

(d)

\dfrac{\text{mass of X}}{\text{total mass of mixture}}