Percent Composition Worksheet
How to find the Percent Composition of a Substance!
Example 1:
To find the percent composition of red M&M’s in a bag of 200 M&M’s, if there are 26 red, you would use this formula.
Mass of Sample x 100 = Percent Composition
Total mass in the sample
So, in the M&M’s problem:
26 red x 100 = 13%
200 total
Example 2:
Find the percent composition of copper (Cu) in CuBr2.
Mass of Cu in the compound x 100 = Percent Composition
Total Mass of CuBr2 Compound
63.546 grams x 100 = 28.4%
223.354 grams
Percent Composition Practice
Find the percent compositions of all of the elements in the following compounds:
1) CuBr2
Cu: ___________
Br: ___________
2) NaOH
Na: ___________
O: ___________
H: ___________
3) (NH4)2S
N: ___________
H: ___________
S: ___________
4) N2S2
N: ___________
S: ___________
5) KMnO4
K: ___________
Mn: ___________
O: ___________
6) HCl
H: ___________
Cl: ___________
7) Mg(NO3)2
Mg: ___________
N: ___________
O: ___________
7) (NH4)3PO4
N: ___________
H: ___________
O: ___________
P: ___________
8) Al2(SO4)3
Al: ___________
S: ___________
O: ___________
Percent Composition Worksheet – Answer Key
Find the percent compositions of all of the elements in the following compounds:
1) CuBr2
Cu: 28.4%
Br: 71.6%
2) NaOH
Na: 57.5%
O: 40.0%
H: 2.5%
3) (NH4)2S
N: 41.1%
H: 11.8%
S: 47.1%
4) N2S2
N: 30.4%
S: 69.6%
5) KMnO4
K: 25%
Mn: 35%
O : 40%
6) HCl
H: 3%
Cl: 97%
7) Mg(NO3)2
Mg: 16%
N: 19%
O: 65%
8) (NH4)3PO4
N: 28%
H: 8%
O: 43%
P: 21%
8) Al2(SO4)3
Al: 16%
S: 28%
O: 56%
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