Question e2e8f

Jan 20, 2014

To get the percent by mass of a mixture, you divide the mass of each component by the total mass and multiply by 100.

Explanation:

"Percent by mass" = "mass of component"/"total mass" × 100 %

EXAMPLE:

A mixture contains 1.203 g ${\text{CaCO}}_{3}$ and 1.797 g $\text{NaCl}$. What is the percent by mass of each component?

Solution

$\text{Total mass" = "(1.203 + 1.797) g" = "3.000 g}$

"% by mass CaCO"_3 = "1.203 g"/"3.000 g" × 100 % = 40.10 %

"% by mass NaCl" = "1.797 g"/"3.000 g" × 100 % = 59.90 %#