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Percent Composition

Percent Composition. Percent Composition. Suppose you sleep 8 hours per day. What percent of each day do you spend sleeping? 8 hours divided by 24 hours/day = .333 .333 x 100% = 33% asleep each day. Percent Composition.

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Percent Composition

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  1. Percent Composition

  2. Percent Composition • Suppose you sleep 8 hours per day. What percent of each day do you spend sleeping? • 8 hours divided by 24 hours/day = .333 • .333 x 100% = 33% asleep each day

  3. Percent Composition • Percent Composition – is the mass of each element in a compound compared to the entire mass of the compound x 100

  4. Percent Composition • Example • What is the % composition of oxygen and hydrogen in water? • Water = H2O = 18 g/mol 2 g H2 18 g H2O x 100 = 11.1 % Hydrogen 16 g O 18 g H2O 88.9 % Oxygen x 100 =

  5. Percent Composition • Find the % composition of a compound that contains 2.30 g sodium, 1.60 g oxygen, and .100 g hydrogen in a 4.00 g sample of the compound? 2.30 g Na 4.00 g 1.60 g O 4.00 g x 100 = 40.0 % x 100 = 57.5 % .100 g H 4.00 g x 100 = 2.50 %

  6. Percent Composition • A sample of an unknown compound with a mass of .562 g has the following % composition: 13.0% carbon, 2.20% hydrogen, and 84.8% fluorine. When this compound is decomposed into its elements, what mass of each element would be recovered?

  7. Percent Composition 13.0% C 100 x .562 g = .0731 g C 2.20 % H 100 .0124 g H x .562 g = x .562 g = .477 g F 84.8 % F 100

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