Percent Composition

What is percent composition?How do I relate percent composition to counting

concepts?How do I calculate percent composition?

Percent Composition• = % (by mass) of each element in the compound • = part / whole

Free Throw Percentages:Shooting% = _# shots made_ x 100

# of shots taken

Ex. make 13, take 17 (13/17) x 100 = 76.5%

Ex. make 9, miss 5 (9/14) x 100 = 64.3%

Bill, Bill, Bill, Bill …. T-shirt!• Bill bought a

new shirt and it has:

65% Polyester 35% Cotton + 100% T-shirt

If I had 100 g of t-shirt, how many grams would be cotton?

Percent CompositionWhen a 13.6 g sample of a compound containing magnesium and oxygen is decomposed, 5.4 g of oxygen is obtained.

What is the % composition?

Percent CompositionPropane (C3H8), commonly used in grills, is one compound obtained from petroleum. Calculate the % composition of propane.