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04-stoichiometry - Wed | Chapter 3 Stoichiometry Focus on...

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1 Week 2 CHEM 1310 - Sections L and M 1 Wed | Aug 29, 2007 Chapter 3: Stoichiometry Focus on Sections 3.2 - 3.9 Chemical Formulas Moles and Related Calculations Bring PRS units on Friday, Aug 31 WebAssign HW due Thurs before midnight Week 2 CHEM 1310 - Sections L and M 2 Mole Avogadro’s Number, N 0 The number of atoms in exactly 12 grams of 12 C. 6.022 x 10 23 entities x mol -1 Mole (mol) The amount of a substance containing as many elementary particles as there are in 12 g of 12 C .
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2 Week 2 CHEM 1310 - Sections L and M 3 Counting in Chemistry 1 mole = different masses of elements Week 2 CHEM 1310 - Sections L and M 4 Molar Mass Given: Molecular Formula Find: Molecular Weight (i.e. Molar Mass) Sulfuric Acid: H 2 SO 4 Solution: (1) Multiply the atomic mass by the # of each atom type (2) Sum the resulting weights H (1.0079 g/mol) x 2 = 2.0158 g/mol S (32.065 g/mol) x 1 = 32.065 g/mol O (15.999 g/mol) x 4 = 63.996 g/mol SUM: 98.077 g/mol
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3 Week 2 CHEM 1310 - Sections L and M 5 Calculations Given: Moles of an element or compound Find: Weight of element or compound EXAMPLE What is the weight of 0.03 mol of gold?
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