M5L3M1 Percent Composition, Empirical and Molecular Formula Problems.doc

M5L3M1 Percent Composition, Empirical and Molecular Formula Problems.doc

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Module 5 Lesson 3 Mastery Assignment Percent Composition & Empirical and Molecular Formulas 1. Determine the percent composition by mass of all elements in C 10 H 18 O. 10 carbon atoms, 15 hydrogen atoms, 1 oxygen atom Carbon mass: 12, hydrogen mass: 1, oxygen mass: 16 120 + 15 + 16 = 151 120/151 = .79, 15/151 = .10, 16/151 = .11 2. Determine the percent composition by mass of all elements in NaClO 4 . 1 Na atoms, 1 Cl atom, 4 O atoms Sodium: 23, chlorine: 35, oxygen: 16 23 + 35 + 64 = 122 23/122 = .19, 35/122 = .29, 64/122 = .52 3. Determine the molecular formulas for compounds having the following empirical formula and molar mass: C 2 H 4 S; experimental molar mass 179 g/mol 4. Determine the molecular formulas for compounds having the following
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  • Winter '14
  • Atom, Mole, Chemical element, Empirical and Molecular Formulas

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