Question

define latent heat of vaporization. explain why particles in steam have more energy than water at 100°C

Answer 1

It is defined as the heat required to change one mole of liquid at its boiling point under standard atmospheric pressure. It is expressed as kg/mol or kJ/kg. When a material in liquid state is given energy, it changes its phase from liquid to vapor; the energy absorbed in this process is called heat of vaporization.

Water vapours at 100 degree Celsius has more energy than liquid water at 100 degree Celsius. This is due to the fact that on converting liquid into gas, latent heat of vaporisation is required.