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# Workshop 3 answer - NAMES WORKSHOP 3(20 points...

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NAMES: ____________________________________________________________ WORKSHOP 3 (20 points) Stoichiometry Spring 2011 1. (4 pts) (a) How many molecules would be found in a 36.0 gram sample of water? 1.20 x10 24 molecules (b) How many atoms would be found in a 36.0 gram sample of water? 3.60x10 24 atoms Since you need to have your answer in atoms, and there are three atoms (two hydrogen and one oxygen) in one molecule of H 2 O, the answer would be three times as great as the answer to example (a). 2. (5pts) A compound is 75.46% carbon, 4.43% hydrogen, and 20.10% oxygen by mass. It has a molecular weight of 318.31 g/mol. What is the molecular formula for this compound? Moles C= 75.46g/ 12 g/mol= 6.288 moles Moles H= 4.43g/ 1.01g/mol= 4.386 moles Moles O= 20.10g/ 16.0g/mol= 1.256 moles smallest number of moles 6.288/ 1.256= 5 * 2= 10 4.386/ 1.256= 3.492 = 3.5 * 2 =7 1.256/1.256= 1 *2 = 2 Empirical formula C 10 H 7 O 2 has MM= 159.17 g/mol Molecular 318.31g/mol / 159.17 g/mol= 1.99= 2 Molecular formula

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Workshop 3 answer - NAMES WORKSHOP 3(20 points...

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