Q. This multiple choice questions uses this graph: i) What is the activity coeff

Question

Q. This multiple choice questions uses this graph:

i) What is the activity coefficient of B at Xb = 0.2 (using the Henry's law convention)?

- h/g

- h/c

- h/i

- i/h

ii) What is the activity of B at Xb = 0.2 (using the Raoult's Law convention)?

- h/g

- h/i

- h/a

- h/c

iii) Which line represents the Henry's Law line for B?

- bc

- ab

- gh

-ef

iv) What is the vapour pressure of pure B?

- e

- d

- c

- a

v) What is the partial vapour pressure of B at xB = 0.2 as predicted by Henry's Law?

- h

- i

- e

- f

Xa. Vapour pressure of volatile liquid B in a binary mixture of A and B. The thick line is the actual measured vapour pressure.

Explanation / Answer

i) For first letter, we'll use henry's approach, which is represented by the top line, so activity coefficient will be as follows:

a = P / P*

Which is real pressure divided by equilibrium pressure expressed by henry´s approach, so correct answer is h/i

ii) Now, using raoult's approach, the equilibrium line to use is the bottom one, hence, the correct answer shall be h/g

iii) bc represnts the Henry's line, as already stated.

iv) Vapor pressure for pure B will be letter a as it is the point a xa=0 where raoult's and measured line meet. It is the point where if pressure increases pure B will start turning into vapor.

v) The partial vapor pressure will be identified in letter i by henry's law, where xa = 0.8 and xb = 0.2

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