Posted by Jude on Saturday, April 23, 2011 at 4:50pm.
Propanol = pr
Methanol = me
Pure pr = 44.6
Pure me = 303
The difference between pure pr and pure me is 303-44.6 = 258.4
delta P from pure pr = 131-44.6 = 86.4
delta P from pure me = 303-131 = 172.0
86.4/258.4 = mole fraction me.
172.0/258.4 = mole fraction pr.
The best way to see this is to draw it out on a piece of paper.
|........131....................|
44.6.....x.....................303
To check the answer I did this.
0.3344 x 303 = 101.32 mm
0.6656 x 44.6 = 29.68 mm
Total 131.000. Of course, that many significant figures are not allowed. You would round to 0.334 and 0.666 which gives 130.9 which rounds to 131. I hope this helps.
I followed this procedure but i was told the answer was incorrect. Any help would be appreciated.
The above procedure is correct as far as I went BUT the numbers calculate the mole fraction of me and pr in the liquid phase. To find the mole fraction of each in the vapor phase,
Xme vapor phase = Pme/total P
Xpr vapor phase = Ppr/total P.
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