prelim_2_key - COVER Chemistry 288 Tuesday 7:30 9:00 PM...

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Chemistry 288 Last COVER Prelim II I<-e ( ? First Tuesday, April 18, 2006 7:30 - 9:00 PM, Baker 219 Middle Initial Complete academic integrity is expected of all students of Cornell University at all times, whether in the presence or absence of members of the faculty or teaching staff. Understanding this, I declare that J shall not give, use, or receive unauthorized aid in this examination. Your Signature: _ As soon as you are told to begin, check to see that your examination booklet is complete, and notify a proctor immediately if it is not. Your examination booklet should contain 9 numbered pages including one work sheet. You may leave when finished, but please do so quietly. Question Al (14) Question Cl (10) A2 (18) C2 (20) (32) C3 (13) C4 (10) (53) Question 81 (3) 82 (4) B3 (4) B4 (13) Question D1 (10) (24) D2 (24) D3 (13) (47) Extra Credit (9) I. 2. ___ (6) ___ (3) TOTAL 156 + 9
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A. NONIDEAL SOLU TI ONS At certain temperature pure liquid A has a vapour pressure of 100 mm Hg. It forms a non-ideal solution with substance B (which it does not "liken). It also forms a non-ideal solution with substance C (which it does "like"). In each case when X A < 0.20 component A exhibits Henry's law behavior (PA = k A X A ) . In one mixture (you judge which) k A = 50 mm Hg, in the other it is 150 n un Hg. a) In the following two graphs draw the Henry 's Law extrapolation and the Raoult' s <0 Law extrapolation to pur e A (use dashed lines). ~ -, Ale mixture AlB mixture I 150 P A I 150 P A 15 15 I ~ I ~ 100 m 10 10 0 m m ~ m J------ . v 50 Hg 5 I r 50 Hg v ~ 2 '> ~ I , o {),la . t '() 1- X A o r-. 0.30 X A 1.00 0.30 1.00 Now go to mole. fraction X A = 0.30 in the mixture with C. QJ b) Next draw (in solid) a likely actual vapor pressure curve for each of the two mixtures. = O Q3 2- a) What is the value Of PA according to your curve? - 2 ~ ""...-' 11'\ Determine the activity and the activity coefficient of A at this mole fraction (X A = 0.30) of A in C. l ( i) for Raou lt's Law (R·L) based standard stale "I ii) for He nry 's Law (H-L) based standard slate o- -,o ,/y rz 7c- I 0-, :;. . R ,., I" 0 1./ If :;: I' ) 2
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Answers aA YA Raoul t's Law { , £ s () ,l5 .5 Henry's Law r: , 5 0 1./_ 7 , The standard chemical potential of A in this mixture (d ~ d o e s not depend) on the choice of the standard state.
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