Question

What is an example of a percent composition practice problem?

Answer 1

Here is an example:

What is the percent composition of table sugar (C12H22O11)?

Step 1:

First multiply the number of each type of element by its atomic mass

Carbon = 12 X 12.01 = 144.13 grams/mole

Hydrogen = 22 X 1.0079 = 22.17 grams/mole

Oxygen = 11 X 15.999 = 175.99 grams/mole

The total mass is 342.29 grams/mole

Step 2:

Divide each element's grams/mole by the total grams/mole and multiply the answers by 100.

%C = (144.13/342.29) X 100 = 42.1%

%H = (22.17/342.29) X 100 = 6.5%

%O = (175.99/342.29) X 100 = 51.4%

You would follow the same procedure to find the percent composition of any substance but you need to know how much of each individual component you have and the total mass.

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