S09 Student Lecture 2

# S09 Student Lecture 2 - OWL Homework...

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OWL Homework http//:www.cengage.com/owl Homework 1 is due Tues 1/20/2008 by 6pm and covers Introduction to OWL Math concepts (some different from CHM115) Homework 2 is due Fri 1/23/08 by 6pm (Released 1/13/08) Covers Week 1 - Reactions & Stoichiometry

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Goggle Sale 8:00 AM – 3:00 PM, Mon – Fri, Jan 12 – 23 (first two weeks!) Outside WTHR 200 or the bookstore anytime iClicker Sale 8:00 AM – 3:00 PM, Mon – Fri, Jan 12 – 23 (first week only!) Outside WTHR 200 or the bookstore anytime
iClicker – Registration Register your iClicker at https://www.chem.purdue.edu/courses/iclicker/Default.asp or Use the link on the Blackboard page NOTE: DO NOT USE THE iCLICKER WEB SITE! Career account = E-mail name before @ sign

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STOICHIOMETRY STOICHIOMETRY - the study of the - the study of the quantitative quantitative aspects of aspects of chemical chemical reactions. reactions.
Mass reactant Stoichiometric factor Moles reactant Moles product Mass product General Plan for Stoichiometry Calculations

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Molar mass (also called gram-molecular weight) Mass of 1 mole of chemical entities (atoms, ions, molecules, formula units) Described with units = g/mol Mass (g) = no. of moles x no. of grams 1 mol No. of moles = mass (g) x no. of grams 1 mol MASS(g) of element AMOUNT(mol) of element (g/mol) Interconverting Between Moles and Grams
MASS(g) of element AMOUNT(mol) of element (g/mol) Interconverting Between Moles and Grams How many moles of H 2 O are in 42g of H 2 O? 1. Calculate molar mass of H 2 O. H = ______________________ O = Total = __________ 1. Calculate number of moles. ___________________= _________

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Calculating amounts of reactants and products Calculating amounts of reactants and products PROBLEM: If 454 g of NH PROBLEM: If 454 g of NH 4 4 NO NO 3 3 decomposes, how decomposes, how much N much N 2 2 O and H O and H 2 2 O are formed? O are formed? What is the theoretical yield of products? What is the theoretical yield of products? STEP 1 STEP 1 Write the balanced Write the balanced chemical equation chemical equation __NH __NH 4 NO NO 3 __N __N 2 O + __ H O + __ H 2 O
454 g of NH 454 g of NH 4 NO NO 3 N N 2 O + 2 H O + 2 H 2 O O STEP 2 STEP 2 Convert mass reactant (454 g) Convert mass reactant (454 g) moles moles

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454 g of NH 454 g of NH
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S09 Student Lecture 2 - OWL Homework...

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