Question

Is Sublimation Endothermic or Exothermic?

Answer 1

Hint:Sublimation is the process of converting matter from a solid to a gaseous state without passing through a liquid state. Sublimation is the term used by those of us who are interested in the water cycle to describe the process of snow and ice changing into water vapor in the air without first melting into water.

Complete step-by-step solution:
Sublimation is the process by which a substance transitions directly from the solid to the gas state without first passing through the liquid state.
Deposition or sublimation is the opposite of sublimation, in which a substance transitions directly from a gas to a solid phase. Sublimation has also been used as a catch-all term for a solid-to-gas transition followed by a gas-to-solid transition (deposition).
While vaporization from liquid to gas occurs as evaporation from the surface if it occurs below the boiling point of the liquid and as boiling with the formation of bubbles in the interior of the liquid if it occurs at the boiling point, the solid-to-gas transition occurs as sublimation from the surface.
The absorption of heat provides enough energy for some molecules to overcome the attractive forces of their neighbors and escape into the vapor phase, resulting in sublimation. It's an endothermic change because it necessitates more energy. By adding the enthalpy of fusion and the enthalpy of vaporization, the enthalpy of sublimation (also known as the heat of sublimation) can be calculated.
Thus, Sublimation is an endothermic process because it requires energy to convert a solid to a gas component. Heat energy is typically supplied during sublimation to cause the physical change from a solid to a gas. In other words, sublimation occurs as a result of heat absorption, which provides enough energy for the solid molecules to break the intermolecular attraction of their particles and transition into the vapor phase.
Thus, Sublimation is an endothermic process.

Note:As it is made up of non-polar molecules held together only by van der Waals intermolecular forces, naphthalene, a common organic compound found in pesticides such as mothballs, sublimes easily. At normal atmospheric temperatures, naphthalene is a solid that sublimes.