Lec6 - Announcements OWL help sessions in OWL Computer Lab...

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Announcements OWL help sessions in OWL Computer Lab (CHM3222) through February 15 EXAM1 Thurs. Feb.28 (on Ch. 1, 2, 3, 4, 7) Dr. Johnson’s office hours: W & Th 1-2pm in CHM1102A or by appointment Greg Beachley’s office hours: W 4-5 pm in CHM1115
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Fundamentals of General Chemistry CHEM131:13xx Spring 2008 Dr. S. Johnson Instructor Mr. Greg Beachley Teaching Assistant Tuesday and Thursday, 3:30-4:45 pm , CHM1402
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Assignments Read: (Ch 1 ,2, 3, 4.1-4.5) for Tues. read Chap. 7.1-7.3 WHW for Discussion Class: will be posted in Blackboard under Written Homework Second half of Ch 4 problems: #11, 17, 23, 29, 41, 47, 51, 55 Clicker ID # to Dr. Johnson if she does not have it Register for OWL and do assignments!!! Bring clicker and calculator to lecture
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Get ready for a clicker question! This counts.
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Elemental analysis for a compound containing P and O gives the following results: 2.0 mol P, 5.0 mol O, and molar mass of 283.88 g/mol. What is the molecular formula of this compound? (atomic mass: P, 30.97; O, 16.00) P2O5 P5O2 P 4 O10 P10O4 7% 3% 85% 5% 1. P 2 O 5 2. P 5 O 2 3. P 4 O 10 4. P 10 O 4
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2 mol P, 5 mol O, and molar mass of 283.88 g/mol Given: Empirical Formula (ratio of atoms in compound): P 2 O 5 Empirical formula mass = 2P + 5O = (2.0)(30.97) + (5.0)(16.00) = 61 .94 + 80 .0 = 14 1.94 g/mol Molecular Formula mass = 90.97 g/mol 2.0 1.94 4 1 283.88 mass formula empirical mass formula molecular = = Therefore, the molecular formula is P 4 O 10
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Lecture Class 6 Outline associated with OWL HW2 Ch 4.3-4.5 Mass relationships in chemical reactions: Stoichiometry (4.3) Reactions in which one reactant is present in limited supply (4.4) Percent yield (4.5)
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A delicious treat known as a s’more is constructed with the following ingredients and amounts: 2 graham crackers (G), 1 marshmallow (M), 1 chocolate bar (Ch) 2 G + 1 M + 1 Ch G 2 MCh Using symbols for each ingredient, write a “balanced chemical equation” for the production of s’mores.
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If you had 1 box of graham crackers and unlimited quantities of chocolate bars and marshmallows, how many s’mores could you make? How many chocolate bars and marshmallows would you need? 1 box : Contains 54 crackers 2 G 1 M + 1 Ch G 2 MCh Unlimited or excess 54/2 =27 G 2 more s' 1 G) (54 = 27 s’more Unlimited or excess G 2 Ch 1 G) (54 G 2 M 1 G) (54 = 27 chocolate bars = 27 marshmallows Amount determined by number of G Know: 2G/1s’more
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Suppose you had a bag of 10 graham crackers, 10 chocolate bars, and 10 marshmallows. What (if anything) will be left over, and how much of that item will there be? What item limits the number of s’mores you can make?
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This note was uploaded on 04/29/2008 for the course CHEM 131 taught by Professor ... during the Spring '08 term at Maryland.

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Lec6 - Announcements OWL help sessions in OWL Computer Lab...

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