I just need help with the last two problems Molecule Q has dipole dipole (D:D) M
ID: 482356 • Letter: I
Question
I just need help with the last two problems
Molecule Q has dipole dipole (D:D) Molecule R has induced dipole induced dipole (ID:ID) forces Which one do you expect to have the larger temperature drop I delta _t I as the liquid evaporates? Molecule R Neither Molecule R and Q will have the same temp drop. Molecule Q Energy for evaporation (delta H _vap) is related to vapor pressure (VP) and intermolecular (IM) forces as liquid rightarrow gas. Which of Not yet answered the following sentences best describes those relationships? Molecules with strong IM forces generally have higher VP and lower delta H _vap Molecules with strong lM forces generally have lower VP and higher delta H _vap Molecules with weak IM forces generally have lower VP and higher delta H _vap Molecules with strong IM forces generally have higher VP and higher delta H _Vap Molecules with strong IM forces generally have lower VP and lower delta H _VapExplanation / Answer
It depends on how much energy required to break the interactions. Since dipole force is much higher than induced dipole force, a large temperature drop is seen in the molecule Q.
Molecule with strong IM force will have strong attractive forces and hence there will minimum tendency for molecules to escape to vapor state . Therefore it will have a low vapor pressure. So in order to evaporate it need energy. So it will have a large Hvap.