Lec7 - 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) 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, 7.1-7.3) for Thurs. read Chap. 7.4-7.7 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 OWL HW3: due 8 am, Mon. 2/25 (Ch 7) Clicker ID # to Dr. Johnson if she does not have it Bring clicker and calculator to lecture
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Get Ready for a mock clicker question.
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What is Snapple? A b eve r a g e Tin infus ed ap ple 84% 16% 1. A beverage 2. Tin infused apple
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Get ready for a clicker question! This counts.
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What mass of CO 2 is produced by the complete combustion of 8.0 g of butane in excess oxygen? 2 C 4 H 10 (g) + 13 O 2 (g) Æ 8 CO 2 (g) + 10 H 2 O (g) 0.1376 moles 2 4 g 3 0 0.5 5 mole s 1% 1% 6% 91% 1. 0.1376 moles 2. 24 g 3. 30 g 4. 0.55 moles
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2 C 4 H 10 (g) + 13 O 2 (g) Æ 8 CO 2 (g) + 10 H 2 O (g) 58.124 g/mol 44.01 g/mol 4C + 10 H = (4)(12.011)+(10)(1.008)=58.124 1C + 2O = (1)(12.01)+(2)(15.999)=44.01 Given: 8.0 g g C 4 H 10 Æ mol C 4 H 10 Æ mol CO 2 Æ g CO 2 2 2 2 10 4 2 10 4 CO g 24 24.23. .. CO mol 1 CO g 44.01 H C mol 2 CO mol 8 g 58.124 mol 1 ) H C g 0 . 8 ( = = 0.1376 mol C 4 H 10 0.5505 mol CO 2 Initially: 0 mol CO 2 At End: 0 mol C 4 H 10 24 g CO 2
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Combustion Analysis for Empirical Formula Given: mass of compound, elements in compound, masses of H 2 O and CO 2 formed Calculate moles of C formed and moles of H formed Calculate moles of third element if required calculate masses of C and H produced (from moles) calculate mass of third element in compound (subtract masses of H and C from total mass of the compound) calculate moles of third element (from its mass) Find whole number ratio of these elements (from their moles, didvide by smallest
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When 0.1156 g of a compound containing C, H, and N is reacted completely with oxygen, 0.1638 g of CO 2 and 0.1676 g of H 2 O are produced. What is the empirical formula of the compound? Calculate moles of C formed and moles of H formed C mol 0.003721 CO mol 1 C mol 1 CO g 44.01 CO mol 1 ) CO g (0.1638 C moles 2 2 2 2 = = H mol 0.01860 O H mol 1 H mol 2 O H g 18.02 O H mol 1 O) H g (0.1676 H moles 2 2 2 2 = = Calculate moles of third element if required: here it is N
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Lec7 - Announcements OWL help sessions in OWL Computer Lab...

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