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PERCENT COMPOSITION

PERCENT COMPOSITION. The percent composition is the mass percentage of each type of atom(element) in a compound . % X = (total atomic mass of X / molar mass which contains X) For Example: Calculate the percent composition of nicotine, C 10 H 14 N 2 . Molar mass = 10C + 14H + 2N = 162 g/mol

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PERCENT COMPOSITION

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  1. PERCENT COMPOSITION • The percent composition is the mass percentage of each type of atom(element) in a compound. % X = (total atomic mass of X / molar mass which contains X) For Example: Calculate the percent composition of nicotine, C10H14N2. • Molar mass = 10C + 14H + 2N = 162 g/mol • %C = (10C / C10H14N2)100 = (120 g/mol /162 g/mol)100=74.1% • %H = (14H / C10H14N2)100 = (14 g/mol / 162 g/mol)100 = 8.6% • %N = (2 N / C10H14N2)100 = (28 g/mol / 162 g/mol)100 = 17.3%

  2. PERCENT COMPOSITION • The percent composition can also be calculated from experimental data. % X = (total mass of X / total mass of compound) A student prepares a compound of tungsten chloride from 3.946 g of tungsten and 3.806 g of chlorine. Assuming the reaction goes to completion, calculate the percent composition. • According to the Law of Conservation of Mass, 3.946 g of W combines with 3.806 g of Cl to give 7.752 g of compound. • %W = (mass W / mass WxCly )100 = (3.946 g / 7.752 g)100 = 50.9% • %Cl = (Cl / WxCly )100 = (3.806g / 7.752 g)100 = 49.1%

  3. PRACTICE PROBLEMS #11 A _____1. A 45.9 g sample of Copper, Cu, combined with oxygen to give 51.69 g of an oxide compound. The percent composition of this compound is: a) 88.8% Ca, 11.2% O b) 24.4% Ca, 75.6% O c) 60.1% Ca, 39.9% O d) 11.3% Ca, 88.7% O 2. Calculate the percent composition for each set? H2O H =_____ O = _____ H2O2 H =_____ O = _____ 3. How many grams of sodium will combine with 567.0 g of sulfur to form Na2S?. 11.1% 88.9% 5.88% 94.1% 815.6 g

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