The vessel contains 1 kg of water vapor and 1 kg of boiling water at a temperature of 100 degrees Celsius

The vessel contains 1 kg of water vapor and 1 kg of boiling water at a temperature of 100 degrees Celsius. The internal energy of water vapor in comparison with the energy of boiling water ..

The internal energy of water vapor will be greater than the internal energy of boiling water, since the formation of water vapor from water requires energy from an additional source. This very energy spent on vaporization, according to the law of conservation of energy, is converted into the internal energy of water vapor.