Which statement correctly describes the relationship between intermolecular forc

Question

Which statement correctly describes the relationship between intermolecular forces and the normal boiling point for a pure solvent? A) The stronger the intermolecular forces the higher the normal boiling point. B) The weaker the intermolecular forces the higher the normal boiling point. C The weaker the intermolecular forces the lower the normal boiling point. forces. normal boiling point is independent of the strength of the intermolecular E) Both statements A and C are correct. 12. Toluene has delta H_vap = 38.06 k/mol and a normal boiling point of 111.0 degree C. Determine the vapor pressure of toluene at 50.0 degree C. A) 677.3 Torr B) 82.68 Torr C) 3.339 Torr D) 700.0 Torr

Explanation / Answer

11) OPtion E

both A and C are correct

Boiling temperature is directly proportional to the intermolecular forces.

The higher the intermolecular forces, higher is the normal boiling point.

12) From Clausius - Clapeyron equation

log (P2/P1) = delta Hvap / 2.303xR [1/T1 -1/T2]

Given delta H vap = 38.06kJ/mol , T1= 50C = 323 K , P1 = ? , T2 = 111C = 383K , P2 = 760 torr

substituting these values ,

we have P1 = 80.025 torr

Thus OPtion B is correct

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