Question

Define heat of Vaporization...​

Answer 1

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The term latent heat of vaporisation can be defined as the amount of heat needed for the conversion of 1kg of liquid at its boiling point to gas at same temperature.

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Answer 2

Answer:

Heat of Vaporization Definition:-

Also known as enthalpy of vaporization, the heat of vaporization (∆Hvap) is defined by the amount of enthalpy (heat energy) that is required to transform a liquid substance into a gas or vapor. It is measured in Joules per mole (J/mol), or sometimes in Calories (C).

Heat of Vaporization Explained:-

The heat of vaporization always has a positive value because enthalpy is always added to a system in order to vaporize a liquid. As the molecules gain more kinetic energy, they become more likely to separate from the liquid and become a gas.

The required increase in internal energy can be described as the energy needed to break the intermolecular interactions in the liquid. The weaker the bond between atoms, the less energy is needed to break those bonds.

The amount of energy required is a function of the pressure at which the transformation takes place, and is temperature dependent. The hotter the liquid already is, the less energy is required. At higher pressures, more energy is required. There is a critical temperature at which the heat of vaporization vanishes (Tr=1). Past this critical temperature, the substance is distinguishable neither as a liquid nor a vapor. Instead, it becomes known as a supercritical fluid.

Heat of Vaporization Formula

A very basic equation to calculate the heat of vaporization is:

ΔH(VAP) = H(VAPOR) – H(LIQUID)

This calculates the difference in internal energy of the vapor phase compared to the liquid phase.