Question

Pa = (235 y - 125 xy) mm of Hg. P is partial
pressure of A, x is mole fraction of B in
liquid phase in the mixture of two liquids
A and B and y is the mole fraction of A in
vapour phase, then po in mm of Hg is:
1) 235
3) 110
4) 125
2) o​

Answer 1

Answer:

ΔTb=3×0.1×0.512

Explanation:“The partial vapour pressure of any component in the solution is directly proportional to its mole fraction”. PA = KXA  

Where, PA  =  Partial vapour pressure of A

XA  =   Mole fraction of A in solution

For pure liquids XA = 1

Then K = P0A Where P0A  is the vapour pressure of component A in pure state

Hence, PA  = XAP0A  

Similarly for component B , PB = XBP0A

Roults law  is applied for a solution of liquid in liquids