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Unformatted text preview: MARK -- ,2. I | QUESTION 2 _ [5] Venue 2 [5} CW 127 ‘ . Carbon tetrachloride. CCl; (1) has a vapour pressure of213 Koolstofieuachloried, CC14 (l) he: ‘11 dampdmk van 231 ton lorr at 40.0 ”C and 836 (err at 80.0 ”C. Determine its by 40.0 ”C en 836 tort by 80.0 “C. Bepaal die Tutorial A2 0 re A2 I pd g enthal; o vaurlzation andnormalboilin- uinl. dam drukenlaI-ie en die normals kook unt van CCI... 3‘32"“ Méhflo Student number Studentenommer Signature Initials _ Vaorletters Handielcening Date Datum 20 August 2013 This is an open book test. Dit ls’n oophoektoels. All test candltinns apply. Alle toeBkondlsfes is van tnepasslng. Submit only this page. slegs hierdle bladsy word ingehandls. Time: 12:15 —- 13:00 Tyd: 12:15 — 13:00 QUESTION 1 [10] VRAAG 1 [10] l I Ascorbic acid (’vilamir: C, Cgflgogj is a water soluble vitamin Askurbiensuur (Vitamien C, CsHaOfi) is ‘n wateroplosbare i A solun'on containing 80.5 g of ascorbic acid dissolved in 2l0 vitamien. ‘n Oplossing van 80.5 g askorbiensuur in 210 g g water has a density of 1.22 30:11.” at 55°C. Calculate: water hat ‘I: digtheid van 1.22 gm! by 55"C. Bereken: | (a) the mass percentage, (17) the molefiaction, (c) the (a) die massapersenmsie, (b) die molbreuk, (c) die molaliteit, molalily. (d) the malaria): ofthe ascorbic acid in this solution (d) die molariteit van die askorbiensuumplossing. ! A} Mass 70 -‘ -esiffl§£w~ £53. x :00 = 031,-? Z a: .a- £5.39; 5.. fl. m». _ QUESTION 3 [5] A 2.00 L sample 0f02 (g) is collected over water at a total pressure of 785 ton and 25°C. When the 0; (g) was awed (water vapour removed), Ila: gas had a volume of 1.94 L al 25°C and 785 Ian: Calculate lhe vapour press-we afwater at 25°C. VRAAG 3 [5] ’n 2.00 L Monster van 0; (3) word our water by ’n mule druk van 785 ton en 25°C versamel. Toe die 02 (g) gedroog word (waterdamp verwyder), het die gas ’n volume van I34 L by 25 ”C en 785 ton. Bereken die dampdruk van water by 25°C 0 = $0.5 23%;”; .. 0.4”! ““57 bl M Q #5 2’ j remaszJ ,‘jO .1— $1le x {vi/fl : 3,. {:{ég ”‘37 13.01577 I 7mm = 0.45:! = 0.0321 o.45'¢’€+!i.éG£ flaw _ UN»! £3 (a mas-”H #31 = 3,153“ 0.3;)l0k'1 ' l v CM! 127 G) University of Pretoria CMY 1'37 2/2 © Unluersiteit van Pretoria A2 (Tues am) 1/2 2013 A2 (Tues aml _ 2013 MARK MIII/20 CMY 127 Tutorial A2 / Opdrag A2 Student number S‘tudentenommer This is an open book test. All test conditions apply. Submit only this page. Time: 16:15 — 17:00 QUESTION 1 [10] C amphar, a whim solid with a pleasant odour, is extracted from the roots, branches and trunk ofthe campizar Iree. Assume you dissolve 45. 0 g ofcamphor ((3191-1100) in 42.5 m! of ethanol, CZH5OH. Calculate the (a) malaria (b) moiality, (c) male fiaction and (d) mass percentage of camphor in this solution. (The. dmi of ethanol is 0 785 g in!) “Q, =0 ‘2? ?'\l"‘\_‘=:: 4,903 an “MA Inifiais Vow-letters Signature Handrekening 20 Augmt 2013 Dit is 'n oopboektoets. Alle toetskondisies Is van toepassing. Slegs hlerdie bladsyword inxehandlg. M: 16:15 - 17:00 VRAAG 1 [10] Kanfer, ‘n wit vastestof met ‘11 aangename reuk, word geékslmeer van die wortels, takke en stomp van die kanferboom. Veronderstel 45.0 g kanfer (Owl-1160) word in 425 ml etanol, C2H50H, opgelos. Bereken die (a) molariteit, (b) molaliteit (c) molbreuk an (d) massapersemasie van kaufer in hierdie oplossing. (Die . 'gtheid van etanol 15 0 .785 glrnl.) Ifsdwl‘fm =0 Flaw? [53 33-58:} 9 mass chMuaes/l 4.9,in x a qggflé : 353..QJCJ Mass @0010». : “\D 4. ggfi‘év{= 34gé9~€j l/al um W323“. = 343.1:9S3 X Jr}: a 494.31; «IL. 0.883} r\ ,. 0.961% = (1%le M .._..——-—_ V 0.496811 CMY 127 A2 (Tues pm) @ University of Pretoria 1/2 2013 .“ - ng VRAAGZ Koolsrol’reu'achloried, CC}. (i) bet ’n dampdruk v torr by 40.0 “C en 836 ton" by 80.0 “C. Bepaal die ' ' uuntvan CCE4. quesnon 2 [5] Carbon terrachloride, CC]; (I) has a quour pressure af21‘3 tor-r at 40. 0 “C and 836 torr c1180.!) ”C. Determine its enthal‘i a vaorization and normal boilin - J . int. (an; hl/Nni) rum ! 'iw ‘ AW“ - any, elm Mimi be~ “T30 W“ @319 ‘3 ,.%q-:n3 i it} 37332: 2.3 M 3‘3 QUESTION 3 A 2.00 L sample of 02 (g) is collected over ware:- ar a total pressure of 785 rorr and 25"C. When the 0; (g) was dried (Weller vapour removed), the gas had a volume (#194 L at 25"C and 785 torr. Calculate the vapour pressure ofwater a! 2.5“C. E5] 'n 2.00 L Monster van 0; (3) word our water by ’11 male druk van 785 torr en 25°C versamel. Toe die 02 (g) gedroog word (waxezdmnp vemrydcr), het die gas; ’n volume van 1.94 L by 25 “C en 785 torr. Bereken die dampdruk van water by 25°C _ {:2 857x!) .0?) l $51; mil ”r ‘“ , , : 0:) CF” (an; ‘99??sz . . ,. -3 r1 (U10): 00844-0021? = and.“ to Mo : axial!“ 2 0030.! L g (o, 0:? I! a 44) o‘ogflq €62,0— : zflLopr : “13¢ +3". CMY 127 2/2 Q Universiteit van Pretorla A2 (Tues pm] 2013 MARK PUNT [2° CMY 127 Tutorial A2 I Opdrog A2 Surname ,. , Initials memo Student number Signature .S‘Iudemenommer Hmdtekem‘ng - D-te "‘0’ 21 August 2913 This is an open haul: test. Dit is'n onphoektoets. All test conditions apply. Alla toeskondisies is van toepasslng. Submit only this page. Slegs hierdle bladsv word lngehandlg. Time: 12:15 — 13:00 Tyd: 12:15 — 13:00 QUESTION 1 [10] A sulphuric acid solarion, containing 571'. 6 § of H130, per litre ofsolurion, has a densily of i 329 g/cm. Calculate: (a) the mass percentage, (1:) the molefi-acrion, (c) the molality and (a) the molorizy of the HJSOJ in this solution. Mass sob-Jinn #000,”: x l'gg-Tj-LLQ : [3:119 Vim mm - IBM- 5:14 H145 a) M... ‘2 4:111 —— 430:7. /3é7j 506A VRAAG 1 [10] ’n Swaelsuuroplossing, war 57]. 6 g H2504 per liter oplossing bevat, het‘ n digtheid van 1. 329 g/cmB. Bereken; (a) die massapersemasie, (b) die molbreuk, (c) die molaliteit an (d) die molaritcit van die H2504 oplossing. CMY 127 Q Universlty of Pretoria A2 (Wed am] 1/1. - .2013 QUESTION 2 Nitric acid, HNO; (1) has a vapour pressure of 133 (arr a! 40. 0 ”C and 670 torr at 80. 0 ”C. Determine its enthalpy of va rizan'on and normal built}: . : int. E 3* “7: 440-. —A« .r: m... _ )5 7—3—33. Eiffs’gfiSS-‘i AW” : 3% L8. 2 3].“? QUESTION 3 A mixme of gases oomaim I0 25 g osz, 2. 05 g ofH2 and —‘b 7 63 fNH3. Hike total: pressure of the mixture 1's 2. 35 mm. w}: is the artful I assure a each comnnent? n N = 1049“ 5‘ L533. (1.) j 3?.0743 Q 0258 n (”ASE-LIT} flier X {Hurti— F71” 5397} H230? ' >€ . 7/5045 - 0. 34b "—3 gills: 1': Vi, “fiL‘fi 1’ MM are a we W "’ PM” QAQ’QO : ,311'588 [1L 1.—*"" l M" \: a_o§c 114:5? : 2. orfi-oufl o.li‘?8 —2> 64:)“: 7%: ass‘S —w PH 5 ,7” (3.392%) = i. 3094‘“ [5] VRAAG 2 [5] Salpetersuur, HNO; (1) het’ n dampdmk van 133 torr by 40.0 °C an 670 um by 80. 0 ”C. Bepa ll die dampdrukentalpie en die normals koo - unt van CCL w’ i “ 3:3.rs {a}, a ”LT/w!" . “1 r 3 Opt! H1." l ‘l'é J [5] ’n Mengsel van gasse bevat 10.25 g van N2, 2.05 3 van H: on 7.633van NH}. As die totals druk \an die mensel 2.35 aim is, wat is die miéle drukke van elke was? .03de = 0:43043!“ 21M}, (-3- Squ4/_:\ 0 5?: 511,44 CMV 127 A2 (Wed am) 21'1 © Universiteit van Pretoria 2013 CMY 127 Tutorial A2 I OpdragAZ Surname Van Student number Signature Studentenommer Handrekening Date -— ..... This is an open book test. All test conditions apply. Submit only this page. Time: 12:15 — 13:00 Initials Vaoriefiers 22 August 2013 Dit is 'n oupboektoets. Alle toetskandisies is van toepassing. Slegs hierdie bladsy word ingehandig. Tyd: 12:15 - 13:00 QUESTION 1 [10] VRAAG 1 [10] A solution containing 131.6 g ofcitric acid (€511.10?) ’n Oplossing van 131.6 g sitroensuur (C5H307) in 420 g dbsolved in 420 g waier has a death); of i. [2 g/mf at 35°C. water het ’n digtheid van 1.12 gfmq’. by 35°C. Bereken‘. Calculate: (a) rhe mass percemage, (b) the molefi'action, (c) (a) die massapeiserimie, (b) die molbreuk, (c) die molaliteit, the mobility. (a) the molarity of the emigre acid in this (0) die molariteit van die askopbiensuuroplossing. solution. 6‘ L’ ‘5 "I’m 03) Mi...“ 370 = iZi,.';:1c,i"iilfi___ x100 = 33.6162, |51.L i491) %_ .3 .a. mi Mg m 5‘? a. his mi 14ch :. 019$?) ‘ . 53.2 i4 i0. Efiiu Tea 5.50% i CMY 127 © University of Pretoria A2 [Thurs aml 1/2 - 2013 quesnon z _ [5] VRAAG 2 [5] Magnesium, Mg, has a vapour pressure of I 0 torr a: 720.0 ”C Magnesium, Mg. bet ’5: dampdrnk vau 10 ton- by 740.0 “C an and 100 torr at 900.0 “C. Determine its enthalpy of va fixation and normal boiiim . aim. 100 torr by 900.0 “C. Bepaal die dampdmkenmlpie en die rim-male kockuru van CC]... QUESTION 3 [5] VRAAG 3 [5] A mixture of gases contain: 12.25 g of 02, 12. 05 g Offlz and ’n Mengsel van geese bevat 12.25 3 van 0;, 12.05 g van H; 17.63 g of H20, 13“ the total pressure of the mixture is 3.45 en 17.63 g van H20. As die total: dmk van die mensel 3.45 am, what is the artful res-sure a each com nent? aim is wat is die narsiéle drukke vun elke 1: 27 MS] 07,?- JQJSj x I'Mfl = 0.38’QEM37 . 3011351] QOISKU "(”20): [7263.37 X. (My) : 01?:3C33é spur) ' 18.0i52. \ ”17"”: 31.3314 “/7 8.: 7M.” - Oiiiali-xg. we = 0.180 aw 2,3334 ‘ pkg: gate— 3 5113 \( 5((Srd‘vu : ($2.81 W 11.3310 91.0.7692 . 0.69% 13.4%.. : oesoaiv 313304 CMY 127 ZIZ © Universiteit van Pretoria AziThursarn) 2013 MARK -- 120 CMY 127 Tutorial A2 I Opdrag A2 Sn name . , Va; N\ “2' if‘.’ i n Initials Vow-letters Signature Hantflekening Student number Studenteuammer 23 August 2013 Dit is ‘n oopboektoets. Alle toetskondlsles ls van toepasslng. Slegs hierdie bladsy word lngehandlg. Tyd: 15:15 -— 16:00 This is an open book test. All test conditions apply. Submit only this page. Time: 15:15 —- 16:80 noes-non 1 [1o] vme 1 x" ' [10] A solution containing 25.8 g ofunéa W20) dissolved in ’n Oplossing veIJgS‘ Egylea (CH4N20) in 275 g water het ’11 275 gwarer has a density 1m g/m! 35"C. Caiculate' (a) digtheid “11,1102 g/mey 35°C. Bereken: the mass percentage, (13) the mo efiacrion, (C) the MOM-(I‘m (a) die massapersei‘lwsie, (b) die molbreuk, (c) die moiafiteit, ' o the urea in this satiation. (1 die molariteit van die ureao- lossizv CMY 127 © University of Pretoria A2 [Fri pm) 1/2 2033 QUESTION 2 [5] Nitric acid, HNO; (I) has a vapour pressure r1133 (arr a! 40.0 ‘’C and 670 tarr a: 80.0 “C. Determine its enthalpy of valor-imam and normal boifin - I aim: VRAAG 2 [5] Salpetersuur, HNO; (I) bet ’n dampdmk van 1133 tort by 40.0 ”C an 670 torr by 80.0 °C. Bepaul die dampdrukemalpie en die nonnnle koo nunt van CC14. A mixture of gases contains 10.25 g OfSOQ, 6.55 g ofO; and ‘n Mengsel van gasse bevat 10.25 g van SD}, 6.55 g van 0; 1230,0130}. {fthe total pressure qfrhe mixture is 5.35 em, on 113in 503. As die total: dn.k van die mensel 5.35 atm ‘ is, wat is die nursiéie drukke van eke as? I ressure 0 each com onenr? © Unluersiteit van Pretoria A2 [Fri pm} 2013 ...
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