Question

A binary solution is prepared with 1 mole of liquid a( 0 p 50mm a ) and 1 mole of liq. o b p 100mm b . If pressure over the mixture is reduced, then the pressure at which last trace of liquid will disappear, will be

Answer 1

105 pa
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Answer 2

Answer:

The pressure at which the last trace of liquid will disappear will be 0.5mm.

Explanation:

Given

The mole of solvent A is 1 and mole of solvent B is 1.

Step 1

The formula to calculate the pressure at which the last trace of liquid will disappear will be

$\frac{1}{PT}$ = $\frac{xA}{PoA}$ +  $\frac{xB}{PoB}$

where,

Pt = the pressure at which the last trace of liquid will disappear.

PoA = pressure of pure solvent A.

xA = mole fraction of solvent A.

Step 2

According to the given, the mole of solvent A is 1 and mole of solvent B is 1.

Total mole = 1 +1 = 2.

XA = $\frac{moles of A}{Totl moles}$

     = $\frac{1}{2}$

     0.5

Hence, the pressure at which the last trace of liquid will disappear will be 0.5mm.

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