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QUESTION

# How do you calculate percent composition of a mixture?

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

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

EXAMPLE:

A mixture contains 1.203 g "CaCO"_3 and 1.797 g "NaCl". What is the percent by mass of each component?

Solution

"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 %