Exercise 2 | Liquids and Solids
General Chemistry 2 - Exercise 2
Arrange the following compounds in order of increasing boiling point:
MgO, NH3, PH3 and KCl
MgO: ionic compound ⇒ Mg2+ and O2- = divalent ion ⇒ strong attraction
KCl: ionic compound ⇒ K+ and Cl- = monovalent ion ⇒ strong attraction but less than MgO
NH3: polar molecule + hydrogen bonding
PH3: polar molecule but no hydrogen bonding
Boiling point: PH3 < NH3 < KCl < MgO