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What fraction of energy is used to change the internal energy of water?
The molar enthalpy of vaporization of water at 373 K is 41.16 kJ/mol. What fraction of this energy is used to change the internal energy of the water? (Assume that water vapor is an ideal gas.)
What fraction is used to do work against the atmosphere?
What equation do I use? Thanks
edit: i put in 100% for % in atmosphere, it's wrong
Answer:
Internal energy, U, is a measure of the energy associated with temperature. So when you are changing phase, there is no change in temperature and no change in U. So NONE of the energy goes to the internal energy. All of the energy goes to working against the atmosphere, since you must overcome atmospheric pressure to vaporize water.
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