Question

how much energy is transferref when 1gm of boiling water at 100 degree celcious condenses to water at 100 degree celsious.

Answer 1

It is 4.2 joule....ie the amount of energy

Answer 2

this quantity is called the latent heat of vaporization.

For water it is 4.18 Joules for 1 gm.

For 1 gm of liquid water at 100 deg C to become dry steam of 1 gm gas or vapor at 100 deg C, the heat energy absorbed is 4.18 Joules.

Same energy is released when the vapor condenses at the same temperature.