Percent Composition Worksheet
Unit 2-Percent Composition
Percent composition is the percent by mass of each element found in a compound.
Example: What percent of iron(III) hydroxide, Fe(OH)3, is oxygen?
Step 1: Find the molar mass of the compound.
1 mol Fe = 55.85 g
3 mol O = 3 × 16.00 g = 48.00 g
3 mol H = 3 × 1.008 g = 3.024 g
Molar Mass Fe(OH)3 = 106.87 g/mo
Step 2: Find the percentage by dividing the part by the whole and multiplying by 100.
[pic]×100 % = 44.91% oxygen
Solve the following.
1. What percent of magnesium bromide, MgBr2, is magnesium?
2. What percent of glucose, C6H12O6, is carbon?
3. What percent of Zn3(PO4)2 is zinc?
4. What percent is Cu of CuCO3 is Cu?
5. What percent is of CuCl2 Cu?
6. What percent of AgNO3 is silver?
7. Which has the higher percent of aluminum, Al2O3 or Al(NO3)3?
8. Why is knowledge of percent composition important in the mining process?
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Part II-Find the percent compositions of all of the elements in the following compounds and name all compounds:
9) CuBr2
Cu: ___________
Br: ___________
10) NaOH
Na: ___________
O: ___________
H: ___________
11) (NH4)2S
N: ___________
H: ___________
S: ___________
12) N2S2
N: ___________
S: ___________
13) KMnO4
K: ___________
Mn: ___________
O: ___________
14) HCl
H: ___________
Cl: ___________
15) Mg(NO3)2
Mg: ___________
N: ___________
O: ___________
16) (NH4)3PO4
N: ___________
H: ___________
O: ___________
P: ___________
17) Al2(SO4)3
Al: ___________
S: ___________
O: ___________
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