Percent Composition Worksheet



How to find the Percent Composition of a Substance!Example 1:To find the percent composition of red M&M’s in a bag of 200 M&M’s, if there are 26 red, you would use this formula.Mass of Samplex 100 = Percent CompositionTotal mass in the sampleSo, in the M&M’s problem:26 red x 100 = 13%200 totalExample 2: Find the percent composition of copper (Cu) in CuBr2.Mass of Cu in the compound x 100 = Percent CompositionTotal Mass of CuBr2 Compound63.546 grams x 100 = 28.4%223.354 gramsPercent Composition PracticeFind the percent compositions of all of the elements in the following compounds:1)CuBr2Cu: ___________Br: ___________-1371603810002)NaOHNa: ___________O: ___________H: ___________-137160-3175003)(NH4)2SN: ___________H: ___________S: ___________-137160164465004)N2S2N: ___________S: ___________-137160164465005)KMnO4K: ___________Mn: ___________O: ___________-137160164465006)HClH: ___________Cl: ___________-17716533655007)Mg(NO3)2Mg: ___________N: ___________O: ___________-17716533655007)(NH4)3PO4N: ___________H: ___________O: ___________P: ___________-17716533655008)Al2(SO4)3Al: ___________S: ___________O: ___________Percent Composition Worksheet – Answer KeyFind the percent compositions of all of the elements in the following compounds:1)CuBr2Cu: 28.4%Br: 71.6%-1371603810002)NaOHNa: 57.5%O: 40.0%H: 2.5%-137160-3175003)(NH4)2SN: 41.1%H: 11.8%S: 47.1%-137160164465004)N2S2N: 30.4%S: 69.6%-137160164465005)KMnO4K: 25%Mn: 35%O : 40%-137160164465006)HCl-1132840-388429500H: 3%Cl: 97%-62865154940007)Mg(NO3)2Mg: 16%N: 19%O: 65%-62865154940008) (NH4)3PO4N: 28%H: 8%O: 43%P: 21%-17716533655008)Al2(SO4)3Al: 16%S: 28%O: 56% ................
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