An ideal solution contains two volatile liquids a (p not=100) and b (p not =200).Find the total vapour pressure of the mixture
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Answer is
180 because__
Solution:- 180
Given:-
No. of moles of A (n
A
)=1 mole
No. of moles of B (n
B
)=4 moles
As we know that,
mole fraction=
total moles
no. of moles
Therefore,
x
A
=
1+4
1
=0.2
x
B
=
1+4
4
=0.8
Again, as we know that,
P
T
=P
A
+P
B
⇒P
T
=(x
A
×p
°
A
)+(x
B
×p
°
B
)
Given:-
p
°
A
=100 torr.
p
°
B
=200 torr.
∴P
T
=(0.2×100)+(0.8×200)
⇒P
T
=20+160=180 torr.
Hence the total vapour pressure of the distillate is 180 torr..
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