Analía Bellizzi – Chemistry Classes

Ronald Reagan High School

Percent Composition Exercises

Calculate the percent composition of all elements the elements in the following compounds:

1- Calcium Hydroxide: Ca (OH)2

2- Sulfuric Acid: H2SO4

3- Ammonia: NH3

4- Ammonium Sulfate: (NH4)2 SO4

5- Ethanoic Acid: CH3COOH

6- Calculate the % of water in Epson salts MgSO4•7H2O

7- Calculate the % of the anhydrous salt (without water) in Cobalt(II) Chloride hexahydrate:  CoCl2•6H2O

8- Calculate the % of ammonium ions in ammonium phosphate (NH4)3PO4

9- Which is the % water in Iron (II) sulfate heptahydrate FeSO4•7H2O?

10- Ammonium Iron (II) sulfate hexahydrate(NH4)2Fe(SO4)2•6H2O