hapter 5: rperties Slutis 1. Wax is a slid ixture hydrcar cpuds csistig lecules with lg chais car ats. Which slvet wuld yu expect t e st capale disslvig wax? N-plar will disslve i plar slvet a. HOH. H 3 OH c. F 3 OH d. HOH 2 H 2 OH * e. H 3 H 2 H 2 H 2 H 2 H 2 H 2 H 3 2. Which the llwig will always cause a icrease i the sluility a gas i a slvet i which the gas des t react with the slvet t r a ew sustace? a. icreasig the teperature the slvet ad siultaeusly decreasig the pressure the gas i the space ave the slvet. *. decreasig the teperature the slvet ad siultaeusly icreasig the pressure the gas i the space ave the slvet. c. icreasig the teperature the slvet ad siultaeusly icreasig the pressure the gas i the space ave the slvet. d. decreasig the teperature the slvet ad siultaeusly decreasig the pressure the gas i the space ave the slvet. e. icreasig the teperature the slvet while aitaiig the pressure the gas i the space ave the slvet at a set value. 3. Durig ssis: * a. pure slvet passes thrugh a erae ut s d t.. pure passes thrugh a erae ut slvet des t. c. pure slvet ves i e directi thrugh the erae while the sluti ves thrugh the erae i the ther directi. d. pure slvet ves i e directi thrugh the erae while the ves thrugh the erae i the ther directi. e. pure ves i e directi thrugh the erae while the sluti ves thrugh the erae i the ther directi. 4. The sluility O 2 i water is apprxiately 0.00380 g L -1 whe the teperature is 25.0 ad the partial pressure gaseus xyge is 760 trr. What will the sluility xyge e i the xyge pressure is adjusted t 1000 trr? 1
a. 0.00289 g L -1. 0.00500 g L -1 c. 1.49 g L -1 d. 2.89 x 10 3 g L -1 e. 3.46 x 10 3 g L -1 1 = 0.00380 g L -1, 1 = 760 trr 2 =? g L -1, 2 = 1000 trr 1 1 2 1 1000x0.00380 2 2 2 =0.00500 g L -1 760 2 5. Whe a such as sugar is disslved i a slvet like water, e the served eects is: * a. a decrease i the vapr pressure the slvet.. a icrease i the vapr pressure the. c. a icrease i the reezig pit the liquid. d. a decrease i the ilig pit the liquid. 6. t 23.0, the vapr pressure acetitrile, H 3 N, is 81.0 trr while that acete, 3 H 6 O, is 184.5 trr. What is the vapr pressure a sluti which ctais 0.550 les acetitrile ad 0.350 les acete? ssue the ixture ehaves as a ideal sluti. a. 109 trr. 121 trr c. 130 trr d. 144 trr e. 239 trr cetitrile=, acete= th are vlatile = 81 trr, = 184.5 trr, = 0.550 le, = 0.350 le t =?= + t = X + X = 0.550 0.35 x81 x184.5 121 0.55 0.35 0.55 0.35 trr 7. very dilute sluti ctais 116 g ructse lar ass = 180.16 g l -1 i 1.000 liter sluti. It is placed i a stic erae ladder, which is the suspeded i pure water. What stic pressure wuld develp acrss the erae i the teperature is 26.0? a. 3.36 trr. 12.0 trr c. 151 trr d. 475 trr e. 1217 trr = 116 g = 0.116 g = 180.16 g l -1 V=1 L T= 26 +273 =299 V Π = M R T =. RT. 0.116x0.082x299 RT 0.0158atx760 12.0trr. V 180.16x1 8. t 28.0, the vapr pressure -prpyl ercapta, 3 H 7 SH, is 175 trr, while that acetitrile, H 3 N, is 102 trr. What is the vapr pressure, at 28.0, a sluti ade y ixig 100.0 g 3 H 7 SH ad 100.0 g H 3 N, i Rault's Law is eyed? 2
a. 35.7 trr. 128 trr c. 139 trr d. 149 trr e. 277 trr cetitrile= =41 g/l, -prpyl ercapta = =76 g/l th are vlatile = 102 trr, = 175 trr, = 100 g, = 100 g t =?= + t = X + X = 100 100 41 x102 76 x175 128 trr 100 100 100 100 41 76 41 76 9. lecular with a lar ass 50.0 g l -1 is disslved i 500 g water ad the resultig sluti has a ilig pit 101.53. Hw ay gras were i the sluti? = 0.51-1 a. 30. gras = 50 g/l, slvet = 500 g, T = 101.53, =? g, = 0.51-1. 75. gras T = T - T c. 100 gras d. 125 gras e. 150 gras T. a. 100.02. 100.73 c. 101.65 d. 102.04 e. 103.62 slvet slvet x0.51 101.53 100 1.53 50x0.5 1.53x50x0.5 75g 0.51 slvet 10. sluti ctais 221 g glycerl 3 H 8 O 3 i 600 gras water. The is 1.86-1 ad is 0.51-1. What shuld the ilig pit the sluti e? = 92 g/l, slvet = 600 g, = 221 g, slvet = 600 g = 1.86-1, = 0.51-1, T = 100 T = T + T T slvet 221 x0.51 2.04 92x0.6 0 T = T + T =100 + 2.04 = 102.04. slvet 3
11. sluti, which was ade y disslvig 62.07 g a electrlyte i 500 g water, exhiits a reezig pit -1.86. What is the lecular weight this electrlyte cpud? Fr water, is 1.86-1 ad is 0.51-1. a. 57.7 g l -1. 62.07 g l -1 c. 115 g l -1 d. 124 g l -1 e. 231 g l -1 =? g/l, slvet = 500 g, = 62.07 g, = 1.86-1, = 0.51-1, T = -1.86 T T = T - T = 0--1.86 = 1.86. slvet slvet xt 62.07x1.86 0.5x1.86 = 124 g/l slvet 12. Hw ay les the electrlyte, prpylee glycl 3 H 8 O 2 shuld e disslved i 800.0 g water t prepare a sluti whse reezig pit is -3.72? Fr water, is 1.86-1 ad is 0.51-1. a. 1.60 les. 2.00 les c. 2.50 les d. 2.98 les e. 4.65 les = 92 g/l, slvet = 800 g, =? l, = 1.86-1, = 0.51-1, T = -3.72 T T = T - T = 0 - -3.72 = 3.72 slvet slvet kg x T 0.8X 3.72 1.60 1.86 13. Hw ay gras glycerl 3 H 8 O 3, a electrlyte shuld e disslved i 600 g water t prepare a sluti whse reezig pit is -4.65? Fr water, is 1.86-1 ad is 0.51-1. a. 22.1 gras. 93.6 gras c. 138 gras d. 384 gras e. 478 gras = 92 g/l, =?g, slvet = 600 g = 1.86-1, = 0.51-1, T = -4.65 T = T - T = 0- - 4.65 = 4.65 4
T x1.86 4.65 92x0.6 4.65x92x0.6 138g 1.86 slvet. slvet 14. t 28.0, the vapr pressure -prpyl ercapta, 3 H 7 SH, is 175 trr, while that acetitrile, H 3 N, is 102 trr. What is the vapr pressure, at 28.0, a sluti ade y ixig 80.0 g 3 H 7 SH ad 120.0 g H 3 N, i Rault's Law is eyed? a. 121 trr. 131 trr c. 139 trr d. 146 trr e. 156 trr cetitrile= = 41 g/l, -prpyl ercapta = =76 g/l th are vlatile = 102 trr, = 175 trr, = 120 g, = 80 g t =?= + t = X + X = 120 80 41 x102 76 x175 46.3+75= 121 trr 120 80 120 80 41 76 41 76 15. What is the expected reezig pit a sluti that ctais 25.0 g ructse, 6 H 12 O 6, i 250.0 g H 2 O? Fr water, = 1.86-1. a.-0.10.+0.10 c.-0.186 d.+0.186 e.-1.03 = 180 g/l, slvet = 250 g, = 25 g, = 1.86-1, = 0.51-1, T = 0 T slvet 25 x1.86 1.03 180x0.250 0 T = T + T. slvet T = T - T = 0-1.03 = - 1.03 5
16. ure cyclhexae, 6 H 12, has a reezig pit 6.53. Its reezig pit depressi cstat is: = 20.0-1. sluti was ade y takig 18.55 g a ukw electrlyte ad disslvig it i 150.0 g cyclhexae. The easured reezig pit the sluti was -4.28. alculate the lecular weight the ukw sustace. a.61.8 g l -1.66.8 g l -1 c.229 g l -1 d.578 g l -1 e.1099 g l -1 =? g/l, slvet = 150 g, = 18.55 g, = 20.0-1 -1, T 0 = 6.53, T = -4.28 T = T - T = 6.53-4.28 = 10.81 T x 18.55 0.150 slvet x20 10.81 0 = 18.55 x 20 / 0.15 x 10.81 = 228.8 g/l. slvet 17. Which prperty a sluti is t a clligative prperty? * a. sluility a. reezig pit depressi c. ilig pit elevati d. stic pressure e. vapr pressure lwerig 18. ure ezee, 6 H 6, has a reezig pit 5.45. Its reezig pit depressi cstat is: = 5.07-1. sluti was ade y takig 24.20 g a ukw electrlyte ad disslvig it i 125.0 g ezee. The easured reezig pit the sluti was -1.65. alculate the lecular weight the ukw sustace. a. 138 g l -1. 145 g l -1 c. 258 g l -1 d. 272 g l -1 e. 595 g l -1 =? g/l, slvet =125.0 g, = 24.20 g, = 5.07-1, T = 5.45, T = -1.65 T T = T - T = 5.45 --1.65 = 7.1. slvet slvet xt 24.2x5.07 0.125x7.1 = 138 g/l slvet 6