Question

the solid obtained after solidification of vapour of subimable compound

Answer 1

The ability of any types of solids to sublime depends on the compound’s triple point based on its phase diagram – typically the lower the pressure, the lower the sublimation temperature. (Note that the pressure and temperature of the desired substance must be below its triple point in order to sublime). Solid compounds that can sublime are very rare, for example, solid carbon dioxide (a.k.a. dry ice) can sublime at 1 atm pressure at 78.5 °C. For sublimation to occur, a solid must exhibit a higher than usual vapor pressure, i.e. it must have weak intermolecular attractions. This is normally true for solids with molecules in the shape of a sphere or a cylinder. The theory for process of sublimation lies in basic chemical properties. For example, higher temperatures result in a vapor pressure increase, i.e. the rate of evaporation is increased with heat. Moreover, a higher rate can be achieved if an evacuated system is used.

Sublimation Prediction:

The enthalpy of sublimation has commonly been predicted using the equipartition theorem. A similar approximation can be found for the entropy term if rigid bodies are assumed.

Answer 2

Answer:

the solid obtained after solidification of vapours of sub lable compound is sublime