{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

ex3s09key - Quiz 3 CH 353 Sumer 2009 Vanden Bout Name EE z...

Info icon This preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Quiz 3 CH 353 Sumer 2009 Vanden Bout Name: EE z I Carefully read all the problems. The exam should have 4 questions on 6 pages. The first page has potentially useful information. The last page is for extra writing space. R = 8.314] K'1 mol'l R = 8.314x10'2 L bar K" mol’l R = 8.206x10'2 L atm mol'I K" 1atm = 1.01325 bar T/K = T/°C + 273.15 1 atm—L : 101.325 J 1 bar—L = 100 J g=9.8ms'2 H=pgh dP AS _A_H 102 —AH[1 1] —=_= 1n — =— ——— PI=XIPL dT AV TAV R R [T2 T,j RTfl R 2 AT=KXB K: b AT=Kbm AT=K’XB K’s m AT=Kfm AVAPH 'AFUSH n3 ' H=—RT=[B]RT v (0M {om — =V — =—S mm, M \6T/P M Please sign at the bottom to certify that you have worked on your own. I certify that I have worked the following exam without the help of others, and that the work I am turning in is my own. Signed: ------------------------------------------------------------ Signature Date 1. True/False Circle either T or F for each statement (10 points each) T @ In osmosis the membrane can pass the solute, but blocks the solvent. T ® A 1 M solution of NaCl in water will freeze at the same temperature as a 1 M solution of sugar in water. T ® The temperature the triple point changes dramatically with changes in the pressure since the properties of gases are strongly dependent on pressure. @ F The chemical potential of every substance decreases with increasing temperature at constant pressure. (T F The chemical potential of toluene in a 1M solution of naphthalene (solute) in toluene (solvent) is lower than the chemical potential of pure toluene. 2A. (25 points) Given the following phase diagram of carbon answer the following and provide an explanation graphite 3.01 0. - “11012345678910 T110130 K 1. Is density of liquid carbon every higher than the density of graphite? 3; V0 P P l (1%. 2. Given that diamond has a higher density than graphite, which has a higher entropy? % QL/Ofii AZ?! > O / AUdO 84 O Scampi/Lei? 7 Schfltaxucmk J 3. What is the vapor pressure of liquid carbon at 5000 K. (note the pressure is in Gigapascal or 109 Pa and is shown on a log scale) N Z “0* Pa (0.02 (7%) 2B. (25 points) What is the freezing point of a solution made of 100 mL of water and 5 g of NaCl Water 5 '“ c -. _ r - Density 2 1.0 g cm'3 M 5%; O .\ # OWE; 35 {ha/t b?) Kb: 1.86 °C m-l ‘ J bi Kf = 0.5 °C m‘l Tm = 00°C m": *(2\(D.s°clm")(o.9agsm) : ’oxea‘t (summon: o '- 0.3256 —, 'okfificc L152 (-4) (m3 mexgsi an (I gr) 3. (50 points) You have a closed container into which you place two beakers. The first beaker (#1) contains 10 grams of sucrose (MW 2 342 g mol'1 ) and 100 mL of water ,the second beaker (#2) contains 30 grams of sucrose and 100 mL of water. The entire container is sealed and held a constant temperature of 25°C. The vapor pressure of pure water at 25°C is 0.0317 bar and sucrose is non— volatile Initially which beaker has the higher vapor pressure or are they the same? (0 Bmkw j. (toqsumge) You then leave the two solutions in the container for a very long time and let them come to equilibrium. After they have reached equilibrium what are: At (qt/U ll bl’tum; maze (£556me 1L) 1 ’2 H10 (Biatw’ Z) The mole fraction of water of the solution in beaker #1 Awo\_1%¢m _. i P E2333 _ i9. - mM‘ * ngw‘ The mole fraction of water 0 the solution in beaker #2 M120 : ammo The partial pressure of water in the container l0 Pfizer : 7‘th Yin. 1 (ofiWoMQOSI? bar): oiofiiui bar What is the change in chemical potential between the initial and final states of the system (everything in the container)? {0 Eve/Meme «received (“out far was queshon. Note: you can assume the total amount of vapor is very small and doesn’t significantly change the total volume of liquid. You can assume these are ideal solutions 4. (50 points) Substance X has a triple point at 25°C with a vapor pressure of 250 Torr. The vapor pressure of the liquid is 500 Torr at 40°C. What is AVAPH°? What is AmsH°7 What is the melting temperature of X at 500 bar? ASUBH° = 48 kJ mol‘1 (5C1: [Elli ”L” " EL“ denstiy (s) = 3.2 g cm‘3 56.“), 2618 .15 density (1) = 3 g cm"3 MW 2 40 g mol‘1 (1:13) Ava?“ : 335$? kind-Si . J, _ g -_ WM“ 63 Aim“: AsubHF flm‘oH : (“55' 3;.8?) (EA H E '1; SLCPQ 7:: A)“ m TAV M; )3 ‘. g5, ._ - 73 .. a . -. -\ AV 1 0.02.0? ‘CM3 (406 U“ L : gamut?“ L— (WA ® W \CMS +r) £9— .- ‘1 i ‘03) Wi_‘(\03)<\ Lip-95“,) —\ c C- . 0208 (Zn/13(3) x.) AT -- i005 , wig @5ka F_______________________________ (2:12 K)(‘§:57_M0’q wal ‘) _. I For: ’ _ Lissa Dar K” cmmccr CW (KW m’ : HgL u w W8 law K +\0 Tm U500 bar) ‘"' fincflUA LUCLL‘ 'hi) Cak-GL.LU1K {C(LLLLJ \Oh um wwi Ha (+1 OHS Wc€qwhbriuunj £101) m Know Arm-d- “I”: hbb\'PYZ&L“\-1Qn 0-? R10 «Nu/0% m (qua-l ’m hmm lommrg 5mg Wu: mums LSUan) ccmmot “mug”; “YE/U; wcficr mwg+ awapdwflre Ckhd V‘E LOME_.V1'>( info ‘H/UZ, L-aéaké-,.r LA.) 1 ‘HA Wr‘Q Sdgqr a). m m ma (at ec-NLLLLMJM) I L €7th '50 mL E76 H10 «Wm/1 @430.ch '1 QM mama/Q ”FD 10¢} sugar: «6:: ML H29 621m” 9» Nam/kg] a ”rho '51:. m ‘oow 6W3. was, ...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern