6.6 THE COMPOSITION OF UNKNOWN COMPOUNDS. PERCENTAGE COMPOSITION - defined as the percentage, by mass, of each element in a compound In a 2.0g sample.

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Presentation transcript:

6.6 THE COMPOSITION OF UNKNOWN COMPOUNDS

PERCENTAGE COMPOSITION - defined as the percentage, by mass, of each element in a compound In a 2.0g sample of a hydrocarbon, the mass of the carbon was determined to be 0.801g. What percentage of the hydrocarbon is carbon?

PERCENTAGE COMPOSITION If you calculated the percent composition of a 4.0g sample, what would be your answer? This is known as THE LAW OF DEFINITE PROPORTIONS!

To calculate percent composition, use the following formula: % element = m element m sample x 100%

EXAMPLE 1: A mg tablet of Aspirin, C 9 H 8 O 4 contains 300mg carbon and 8.08mg hydrogen. The remaining mass is oxygen. Determine its percent composition.

LET'S TAKE THIS A STEP FURTHER... Let's try to calculate percentage composition from a chemical formula.

EXAMPLE 2: Determine the percentage composition of calcium hydroxide, Ca(OH) 2

Learning check 1. What is the percentage composition of (NH 4 ) 3 PO 4 N: 28% H: 8%O: 43%P: 21%

HOMEWORK: Mole Airlines -due Wednesday Finish the Problem Set