A solution of methanol and water has a mole fraction of water of 0.312 and a tot

Question

A solution of methanol and water has a mole fraction of water of 0.312 and a total vapor pressure of 21 torr at 39.9 degrees C. The vapor pressures of pure methanol and pure water at this temperature are 256 torr and 55.3 torr , respectively.

Is the solution Ideal? NO, it isnt.

What can you say about the relative strengths of the solute-solvent interactions compared to the solute-solute and solvent-solvent interactions?

a. the methanol-water interactions are stronger than the methanol-methanol and water-water interactions.
b. the methanol-water interactions are weaker than the methanol-methanol and water-water interactions.

Explanation / Answer

if A were true, then we would expect the vapor pressure to be LESS THAN 193.4 not GREATER THAN 193.4 211>193.4 SO B IS TRUE

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