1. U NIT 8: M EASUREMENTS AND C ALCULATIONS IN CHEMISTRY - M OLAR MASS AND % C OMPOSITION Dr. Chin Chu Chemistry River Dell High School

2. I NTRODUCTION Calcium carbonate

3. Sodium sulfate Ethane gas (C 2 H 6 ) % C OMPOSITION E XAMPLES

4. Calculate the % composition for each element in potassium phosphate. Calculate the % composition for each element in dinitrogen pentoxide. Calculate the % composition for each element in aluminum hydroxide. Calculate the % composition for each element in sulfuric acid (H 2 SO 4 ). % C OMPOSITION – EXERCISE PROBLEMS

5. Calculate the % composition for each element in potassium phosphate. [K: 55.2%, P: 14.6%, O: 30.2%] Calculate the % composition for each element in dinitrogen pentoxide. [N: 25.9%, O: 74.1%] Calculate the % composition for each element in sulfuric acid (H 2 SO 4 ). [H: 2.0%, S: 32.7%, O: 65.3%] % C OMPOSITION – A NSWERS