exam 1-2 solutions - Exam#1 Chemistry 112 Spring 2010 Name...

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Unformatted text preview: Exam #1 Chemistry 112 Spring 2010 Name: AW6W€V_WX Last 4 digits of Student ID Number: Show All Work 2 1. (5 points) Arrange the following solutions in order of decreasing osmotic pressure Write “lowest” underneath the lowest. 3) 4.0Murea “1:1 I M 5 (f b) 2.5MNaC1 g: ”‘2. M c. 6' c) 1.5 MBa(NO3)2 “i :1 3 m : ‘r-‘f 6’) 3.0Msucrose i CL 3 M 5 } 2. (8 points) A 1.0 M NaOH solution in water has a density of 1.1 g/mL. Express the concentration of this solution in. molaiity- (MW NaOH : 40 gfmol) .5 WM! % mm mm WM WW ! AW {@an : K; wimé MM? (’5 {#:4711914 I {0099445 xiii; [1&9 WK 2' my}? wflfi Wag €0lwhw CMMMHLQ lmak’ MW” 4W2 Hw-fi 40:: we? : W6 9 ma WNW; TAX/gm“ [flown/1) 3. (7 poil‘lts) Kc at 970 K is 2.0 x 10‘4 K for: N2 (g) + 02 (g) H 2N0 (g) Calculate Kc at 970 K fOr 4N0(g) «a—b 2N2(g)+202(g) WWV‘M’ . z kc“]£fl}/Wfl% .:: /Kc,- VfiVWVf/C’ dbl/1M4! (ijéfll‘C/[W7Zf “’5“ $§VMWE KC, 4. (8 points) List all the intermolecular forces present in a) Methylamine (CHBNHZ) [Q B D D H E b) Carbon dioxide (C02) L D c) chioromethane (CH3CI) (L D D D d) Nitrogen dioxide (N02) L D D D S. (8 points) A £0 Wt% solution of an enzyme in water has an osmotic pressure of 8.7 torr at 298 K. Calculate the molar mass of this enzyme. Assume that the density of the solution is LOO g/mL. WZMRT 5?“ YEW/>6 ”71"” ; (gag/say”, %0 aim/V 0.9m film: /l/l (WWW???) Mr; #55500”? I0 WW7!) fislulgw =1me l QQg» up 500; 692%}{W £002, «fig/ma, JW’QLIV’ ; l [00:49: 90mm: LLE%~?V W" 1003; Aégm‘ZKW/w M Ala/WV” “7L9“ 6. (8 points) A. scientist. seals 0.5 moles of nitrogen dioxide and 2 moles of dinitrogen tetroxide in a 1 Liter container. Kc is 15 at 40°C for: 2 N02 (g) M N204. (g) Caiculate the reaction quotient, Q, and indicate in which the reaction will proceed. R represents to the right, L represents to the left, N means no reaction QMMZ’ @171 Z 3 W 1:} Q9 5’) ’7. (1.4 points) 1 mole of NO2 is placed in a 1 Liter flask at 100 °C. At equilibrium the concentration of O2 is 0.10 M. Calculate KC. 1 Q 0 M2»; Jew. ~6>< 1.92.; w x CQJWW 3‘ "< 1,591., 2170,?) @ L 0 Q 9.2, 9 i 8. (14 points) 1.0111016 of PC}3 (g) and '1. .0 mole of C12 (g) are piaced into a 1 liter flask at 500 °C. PGSCgHCMg) W PC15(g) if Kc x 5, What is the equiiibrium concentration. of PC15. Express your answer to 2 decimai places. I f 1 O C; w>< WK —tx 67, L ”X; («>61 >< 9 9. (14 points) Lanihanum hydroxide, La(()H)3 is dissolved in water. The equilibrium concentration of La+3 is 8.8 x 10'6 Molar. Calculate Ehe value of Ksp. Iwa(0H)3(s) M La+3 (aq) + 3 OH“(aq) 3 Kéf 3: [M9109 94] AméOH)? ””3 [all ~t' 3QHM l WM M" W C «wt 35%; +63% fiche/l x W (:iéflfalz gfiwen Twig; 3y: 5.95%‘15 .::: 25wa 6 M. 6 KW :- (gtgflafléxa é 4'“ >5 “55)? «I? ——-~ 11.5wa W 10 10. (14 points) The Ksp of Calcium Fluoride, C32, is 3.9 X 10'“. Calculate the molar solubility of (321133 in a 1 molar €330)ng solution. Express the answer to two decimal places. {0; F2”‘3 Gnnfifz‘f’ Z33“ C“ fiCFa-th, ”’3’ BC???” +3 1 Pat? H l WfilW 3 mam, Zmflé‘t” 6% F2“) Cal-Uta”? 2F“ l Golly/l 3 ‘9 C vat. {xi —{;Z,>< ll Extra Credit: (5 points) Explain why 500 g of NaCl added to £0 Liters of water will lower the freezing point of the resultant solution more than adding 500 g of KCl to 10 Liters of water. WWW male MM %m k% [L7 97‘6”? 25> flmeLW 6a/wfzm CWW‘thl-zaw 23> fimflii‘fi’ {1663-114 farm 55* Ma’fflfié/W ...
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