chem6bquiz#2

chem6bquiz#2 - Name: Date: Friday, May 9, 2008 Chem 6B,...

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Unformatted text preview: Name: Date: Friday, May 9, 2008 Chem 6B, Spring 2008 TA: Angie K00 Quiz #2 40 points Show all work and calculations used to arrive at your answer. Adequate and CLEAR work with units and the correct amount of significant figures must be shown in order to receive ANY credit. Answers must be ofiset by placing a box around the final answer. Possibly relevant constants: 8.314 J/mol*K; 0.08206 L*atm/K*mol; kb (H20) = 0.51 K*kg/mol l) (2 pts each) Circle each answer: High vapor pressure = high /@boiling point = @/ non-volatile =high low intermolecu ar forces 2) A 12.0% by mass calcium hydroxide solution dissolves 7.50% in water. i) (4 pts) Calculate the van’t Hoff factor i. \M‘ 2-\\W1wal m V1 1'05 ,Mfi “Mam Lawn mm veu‘xmebt) mew“) = 11m ii) (7 pts) Calculate the effective molality of all species. rm C0119“); = 0.0 mm”) 2:: Ga” * lo“, :H'.\”GiYYW'Q 5 \.84m i \_84 0 O 0 08% 14% 97,0 A - was +01% + 2(0 13%) l tm) 0&4)”— oms Le mm (was 0. 2% i (in d\§€0e,, km 2 8R. MB‘QqV‘m = \.’-H) + 015% +0.2‘=|——(D . iii) (4 pts) Calculate the boiling point ofthe solution. ATw$ l\\4\o'WL . r: 0160 (Ma \L-¥%IVV\vQ i (“84 WWW? : \DlSV : \.0K°C, - '1’L -~ |r\l OD!‘ .. fin A Inc I/ 3) (2 pts each) Which is the better solvent for the following, water or CGHG? i) NH3: “10 ii) C82: 94H“? iii) Brz: Co we iv) CH30H: “2.0 4) (7 pts each) Substance A has a molar mass of 72.08 g/mol, and has a vapor pressure of 100. Torr at 20°C. Substance B, with a molar mass of 58.09 g/mol, has a vapor pressure of 222 Torr at the same temperature. What mass of substance B must be mixed with substance A to give a solution with a vapor pressure of 135 Torr? CV: A, I \36 «Wk = 7(A(\oo.ror\r3 “‘ ’Xg (222 nrr) emu M t m =\ , \Qt “NA = \*%8 \95 “W ‘ 0-133 (\UD‘WV’V3 * 18 Q2:% \36 row : \oo «aw i \OO‘W: ‘F 73213 36 = 0,2103 7’9 : Dim M82 (pg oo\ ww—Q) mass : (Wye) “muggy W353 ‘; (0.18? try/1393 5) AHsolmion is found to be negative. i) Amalia = o AWWW " A“ Wri a * MW) 11) A“hydration : 0 D W A“hydration > AHLartice iv) AHLaItice > AI‘Ihydration Q05 Na V) AHLaItice : Athdration a.) (2 pts) Which of the above (IF ANY) is/are always true? (Write ‘NONE’ if none of them apply) (in ) b.) (2 pts) Which of the above (IF ANY) is/are only true in certain cases? (Write ‘NONE’ if none of them apply) ‘ k ‘\ ) ...
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This note was uploaded on 11/02/2008 for the course CHEM 6B taught by Professor Crowell during the Spring '08 term at UCSD.

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chem6bquiz#2 - Name: Date: Friday, May 9, 2008 Chem 6B,...

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