UNIT 8: MEASUREMENTS AND CALCULATIONS IN CHEMISTRY - MOLAR MASS AND % COMPOSITION

Dr. Chin ChuChemistryRiver Dell High School

INTRODUCTIONCalcium carbonate

Sodium sulfate

Ethane gas (C2H6)

% COMPOSITION EXAMPLES

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 (H2SO4).

% COMPOSITION – EXERCISE PROBLEMS

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 (H2SO4). [H: 2.0%, S: 32.7%, O: 65.3%]

% COMPOSITION – ANSWERS