Question

Define the following: a) Latent heaty of fusion. b) Latent heat of
vapourisation. c) Sublimation.​

Answer 1

.Answer:

a) The enthalpy of fusion of a substance, also known as heat of fusion is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure

b) The enthalpy of vaporization, also known as the heat of vaporization or heat of evaporation, is the amount of energy that must be added to a liquid substance to transform a quantity of that substance into a gas. The enthalpy of vaporization is a function of the pressure at which that transformation takes place

c) Sublimation is a type of phase transition, or a change in a state of matter, just like melting, freezing, and evaporation. Through sublimation, a substance changes from a solid to a gas without ever passing through a liquid phase. Dry ice, solid CO2, provides a common example of sublimation

Answer 2

a) The heat energy absorbed at constant temperature during transformation of solid into liquid is called the latent heat of fusion

b) The amount of heat energy absorbed at constant temperature by unit mass of a solid to convert into liquid phase is called the specific latent heat of fusion. c) The amount of heat energy absorbed at constant temperature by unit mass of a liquid to convert into gaseous phase is called the specific latent heat of vaporization. d) The phenomenon in which the ice converts to liquid due to applied pressure and then re-converts to ice once the pressure is removed is called revelation