Respuesta :
Answer:
H2 < O2 < H2CO < H2O < CaO
Explanation:
the boiling point of H2 (20 K) will be lower than O2 (90 K) because the dispersion forces are stronger in O2. The boiling point of formaldehyde, H2CO (254 K), will be much higher because it is a polar molecule and dipole–dipole interactions are present, while water will have an even higher boiling point (373 K) due to the presence of hydrogen bonds. Finally, CaO is an ionic compound where a great deal of energy is needed to overcome the ionic bonds that hold Ca2+ and O2- ions together. Its boiling point is 3120 K. -webassign
