This is a dumb question, but I am pretty certain that water vapour has higher energy than water as you do work in raising the intermolecular potential energy. However, water vapour molecules at 100$^{\circ}$C have the same kinetic energy as water at 100$^{\circ}$C and since internal energy for an ideal gas is only its kinetic energy, while the internal energy of a liquid is its potential + kinetic energy, does it mean that water has higher internal energy than its gas state?
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@RogerVadim I think this can be understood by thinking intermolecular potential energy of the liquid as negative. Is this correct? – Dian Sheng Apr 23 '23 at 06:08
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Yes, this is a good way to see it. – Roger V. Apr 23 '23 at 11:11