262
Aditya Bhutra
·2012-03-27 00:00:05
even i have a similar doubt .
plz help.
21
Swaraj Dalmia
·2012-03-27 01:03:42
I didn't get:
Hence Yt = 3/8 , Yb = 5/6
What is Yt ?
71
Vivek @ Born this Way
·2012-03-27 03:52:35
Okay. We calculate some general things first.
PTotal = 58 mm Hg
XA = 3/5 , XB = 2/5
YA = 9/29 , YB = 20/29
When last drop is remaining, we need to find the pressure exerted by vapour. In that case,
3/5 (which is the mole fraction of the original solution is now the mole fraction of the vapour because almost all has evaporated) = P°Axa(P°Axa + (1-xa)P°B)
We get xa = 5/6 , xb = 1/6
Hence, Pressure required = 5/6 * 30+ 1/6 * 100 = 125/3 mm Hg
A = Toulene , B = Benzene
262
Aditya Bhutra
·2012-03-27 11:06:48
how did u get Ya and Yb ?
21
Swaraj Dalmia
·2012-03-27 12:20:05
thanks vivek for soln.
aditya utilize partial pressure is proportional to mole fraction.
Ybenzene=pbenzene/ptotal
We can get Pbenzene and ptotal from Raults law at equilibrium.