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Answer 1 · 2014-01-20T01:18:00

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

$"Total mass" = "(1.203 + 1.797) g" = "3.000 g"$

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

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