Why aluminium chloride sublime at 180 degree celsius?

Answer 1

The sublimation of a molecule depends on the intermolecular forces.

Since Aluminium Chloride exists as a dimer, Al2Cl6.

It has weak intermolecular forces (also, Vander Waal Forces) due to which it sublimes at a relatively low temperature of 180 degree Celsius.

Answer 2

Aluminum chloride sublimes at 180 degrees Celsius because its vapor pressure exceeds atmospheric pressure at this temperature, causing the solid to directly convert into a gaseous state without passing through the liquid phase. This sublimation process is driven by the relatively weak intermolecular forces in aluminum chloride that allow molecules to escape the solid lattice easily at higher temperatures.

Answer 3

dative bonds between aluminium and chlorine is weak