CH1012
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BP. vs Vap. COMPOSITION I
DGsoln = DHsoln - TDSsoln
Gsoln= Gibbs Energy   Hsoln= Enthalpy  Ssoln= Entropy
1) DGsoln = +ve immiscible liquids won’t mix
2) DGsoln = -ve miscible liquids
(i)   DHsoln  = 0
     pA = poAxA,      pB = poBxB
- ideal solution behaviour
0              xA           1
T
a1
Boiling point curve
Vapour composition curve
(here A is more volatile than B)
V.P. above mixture of A
mole-fraction of A
V.P. pure liquid A
Temperature Composition Diagram (p=1atm)
Vapour
Liquid
condense
heat liquid
Raoult’s Law