The bottom curve represents a solution whose vapor pressure is lower than predic

Question

The bottom curve represents a solution whose vapor pressure is lower than predicted by case, the strength of the solute-solvent interactions is solvent and solute-solute interactions. Raoult's law -in this the strengths of the solvent- 26. Notice that all 3 curves converge as X, Raoult's law! This should remind you of ideal gases! approaches 1. Why? (This is why all sufficiently dilute solutions obey 27. What is the vapor pressure of water above a solution t hat is 5% sucrose by moles) at SOC? (Vapor pressure is attached.) Don't t forget that Raoult's law (as written above) is in terms of the mole fraction of watert that Temperature ('C) 80 100 10 30 40 60 Vapor Pressure (mm Hg) 355.1 525.8 760 92 17.5 31.8 55.3 92.5 149.4 233.7 3 28. The vapor pressure over a solution of urea (CH.N,O) is 291.2 mm Hg. The vapor pressure of pure water at the same temperature is 355.1 mm Hg. Calculate the mole fraction of urea in the solution. Don't forget that Raoult's law (as written above) is in terms of the mole fraction of water

Explanation / Answer

Ans 26 : more

Since the vapor pressure of the solution is lower than the one expected according to the Rault's law , this indicates that the solute and solvent interactions are stronger than the solute-solute and solvent-solvent interactions, due to which now more amount of energy is required to vaporise the same amount of substance than earlier.

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