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apsolnwskey0809 - [Fa/Millisll'y SOIIIIIIIIIS(’...

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Unformatted text preview: [Fa/Millisll'y- SOIIIIIIIIIS (’ apchemsolnprac0809.doc Name: [424 Date: Period: 1. An aqueous solution of ethanol, C2H50H, that is 12.0% ethanol by weight, has a density of 0.9819/mL at 20.0°C. The molecular mass of C2H5OH is 46.0g/mol. What is the molality of ethanol in this solution? 27» Irv/0m! #6 50M/lrf Ms: : #2an (.9, 77/71“) ; 9’; / mus (ins—0H 5 914? (p.120): ”obj“: ”M“ W _: 751,4 —//,ng : 96.37 mm, Gus—0H: //,fi/5’6.07/i~e> 1er ”" 'zgésw/ ”“315; =— 2. What is the mole fraction of water in the water-ethanol solution given in question 1 above? Wk #21) <’ 6‘. $3, //5/'0/57/“_e 3 “77M 160 547%.1/{0 : s ’ ‘ ’ z 4'7‘7MHM+.1$’6$‘M4;/§0H) ”77/7 [777 [W920] 3. What is a colligative property? Name the four colligative properties studied in this chapter. fl alla?4‘,+l‘ve ’ow’u’r‘v’fi? /3 0w» 7544+ 071/7 ohws m 7"k— hm‘v—y 7 fat/«11¢. lap/facts) ”19% fluff ,M¥/¥,~ 77’s ““7167 d/Jcbsks Ffl‘f/njfozm-l- @pmm, V470” press-W Arm)»; ) boi/“fi puk/ 5/81/47404- M4 55M”; P”““’"‘" 4. Which one of the following does NOT affect the solubility of a gas in solvents? a. identity of the gas b identity of the solvent c. pressure of the gas d. temperature e. mospheric pressure C- m. teary; y“, wwr flW “f” “WI/”‘7" P“““”‘°' 5. An ideal solution is formed from a mixture of the nonvolatile solute, urea (CO(NH2)2), and methanol (CH30H). The vapor pressure of pure methanol at 20.0°C is 89.0mmHg a. Calculate the mole fraction of urea that is obtained from mixing 6.09 of urea with 32.0g of methanol. 4.. o , xu=.”_~;:(m’ : 0.09; ”w “4'" [72; J (33.9)] 0:0 32.0 _ _ b. Calculate the vapor pressure of the methanol solution made In part a. Aim Xmas; 75;”, :[Mé'aoqzyg‘r’w/V‘O) 3&5" ”(7] c. Calculate the change in Vapor pressure for the methanol solution in part a compared to pure methanol. A? =- 6)” Ta,” a 99’813Emmuzj 6. Benzene, C5H5, and toluene, C6H5CH3, form an ideal solution. At 35.0°C, the vapor pressure of benzene is 160.torr, while that of toluene is 50.0torr. If 3.20 moles of benzene and 4.80moles of toluene are placed in a closed container at 35.0°C and allowed to come to equilibrium a. what is the mole fraction of benzene in the liquid state? r -L. W m ,9 ' : f v . . nb+nc . (3.1.olr'f. FOX b. what IS the mole fraction of benzene in the vapor phase? P 7 beo r flea: 5'VD/Mv0) + /0’60)[5o) .7 é V4.30 : 9740M ‘f is Y -P, :51:- v” 99 fir 3.7/96'1‘} 7. A compound is found to contain 40.3% B, 52.2%N and 7.5%H. A “9 sample of this compound is dissolved in 50.009 of benzene producing a solution with a freezing point of 1.3°C. Kr for benzene is 5.12°C/molal and it has a pure freezing point of 5.48°C i a. Determine the empirical formula of the compound from the percent composition. 8’: V047 flan/7M 3 3‘73 ”3 7";02/mm/4 = 79/3 N : swig/”JV”; 3 3,7: t (éfl 83.73 N3.73 [47.73 b. What is the molality of the benzene solution? J, - AT ‘ 5'73'1'3 .. E “mass m « 7:»— » . z “1'" , M 2' F 5'. I7, ’ ’ c. Determine the experimental molecular weight and molecular formula of the compound. ' b, ”use ”+10 $01,414.; 3316i} 5"“1’ ; 45cm” WWW... 5,7; 2 W 0. 05‘000ka Soil/”f k? 7 ”alsolwft/j‘g 5,»er —_ '. fl . ‘9 5 8/042», :zmtf . 8. Determine the approximate van’t Hoff factor, i, for a 0.001molar A|(NQ3)3 solution. Y0, y / 3 K; Q41 \A \ 6 Show/4‘ 5' “WW/”wk if 0. 00 IM 3/00}. 61/550“ 1‘4”!“ 1,6. { Frugal/#tah ”a if [long 9. For which of the following aqueous solutions would one expect to have the largest van’t Hoff, i, factor? a. 0.100m C6H1206 (glucose) b. 0.100m NaCl c. 0.010m NaCl d. 0.100m K2504 ..010m K2504 Food- k;5041 diss‘ootmféf‘ pm'dums 3;}...5': . . . _ _ 3’2” 6,“! fpfi- If /§ /a'w .cMCM7Z/414/hl Map/16" ”/aflZ (”“0479” 10. Calculate the molar mass of a small protein if a 0.209ram sample dissolved in 100.mL of water has an osmotic pressure of 9.8mmHg at 25.0°C. 777/;n/2'7’ 77v: mm‘ Kevan ”tr/ML M M : EFL??? :(0IL02X,09LI)[Z‘7?NSK) M337 76,6 2/n/ (7‘ 97/7406 I00 L) i: 3. 8 x 10530.0] 11. Both freezing point depression and osmotic pressure can be used to calculate the molar mass of a substance. Briefly describe which method would be better for determining the value of high vs. low molar mass substances. aswf-ML pmxsw CM 1:. Mia/M /w 110'? all/Mtg, {fl/fivi/én: .WW‘ gffi'aUd’r # FPfl/R‘SIP‘ CM” an; 56 erd PW“ rc/M‘wél) cnw‘t‘me rah/“"1071“- . 7’21. cwyfmu- a? 7544/1" far-f //”7’° moo/AM My; hpézw’é-J, ,/\‘ 0§M1L"GWVCSSW~;J 3/“ ...
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