Vapor Pleasure of a Solution of Chloroform & Pyridine at 25°C MY QUESTION: Obvio

Question

Vapor Pleasure of a Solution of Chloroform & Pyridine at 25°C

MY QUESTION: Obviously, the answer to this problem is already written in the graphic below. Can somebody help me understand how the problem is solved and what exactly is going on in this problem, so I can do a different version on my exam proficiently? Please do not answer if you cannot provide detailed explanation. THANK YOU!

?s FROM GRAPHIC:
a) What are the approximate vapor pressures forWhat are the approximate vapor pressures for Chloroform at 25°C
b) Which has a stronger intermolecular force?
c) If equal masses of the two solvents are combined into a solution, what would be the Total Vapor Pressure?

Explanation / Answer

SOLUTION

PART A

The vapour pressure due to chloro can be easily seen from the left part of the graph when the solution is pure and contains 100% chloroform . At 100% chloroform the yaxis can be seen to be 27 torr

Part B

We can see that the Boiling point of Pyridine is much greatyer than the chloroform which means that the intermolecular forces are stronger for Pyridine which makes it difficult to break the bonds and hence increasing the boiling point

Part C

Let us suppose the mass we have equal masses say 100 grams

Now moles of each = 100/ MW

Chloroform = 0.838

Pyridine = 1.264

Now we find the mole fraction for each and point that location in the graph and take out the corresponding value

X pyridine = 1.264/2.102

X chloroform = 0.838/2.102

Now for pressure we calculate = Xchloroform * Pchloroform + Xpyridine*P pyridine

= 14.97 torr

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