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Worksheet 22: Percent composition calculations Topic 6

Set A: Percent composition by mass Objective: To test your ability to calculate percent
composition by mass of substances

For each formula below, calculate the percent composition by mass for each element .
Show set up for calculating percent composition for each element using equation below. Then solve.
Total mass of the element Table T equation

% =

Formula mass x 100
show set up here Write answers here

1. NH3 % N =

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% H =

2. NaNO3 % Na =

% N =

% O =
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3 . Ca(OH)2 % Ca = Need help? Study Book pg 127 Set 10

% O =

% H =

4. (NH4)3PO4 % N =

% H =

% P =

% O =

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