Question

a liquid mixture of a and b contains 1 mole of each ,if the pressure is reduced at what pressure does the last part of liquid disappear .? p°a=400 mm hg p°b=100 mm hg​

Answer 1

Answer:

what is the meaning of pa?

Answer 2

Given:

A liquid mixture of a and b contains 1 mole of each.

To find:

If the pressure is reduced at what pressure does the last part of liquid disappear .? p°a=400 mm hg p°b=100 mm hg​

Solution:

From given, we have,

A liquid mixture of a and b contains 1 mole of each.

The last part of the liquid will disappear when the composition of the vapour phase become χa=0.5 and χb=0.5.  

The pressure at which this occurs can be calculated as follows:

1/P = χa/Pa∘ + χb/Pb∘  

1/P = 0.5/400 + 0.5/100  

1/P = 0.25

P = 4 mmHg

Therefore, the pressure at which the last part of liquid disappear is 4 mmHg