Why is condensation of water vapor regarded as exothermic reaction?

1 Answer
anor277
Apr 24, 2018

Look at the energetic symmetry of a physical or chemical reaction....

Explanation:

#H_2O(l) + Delta stackrel("boiling of water")rarrH_2O(g)#

Now conservation of mass, and conservation of energy, INSIST that both mass and energy are conserved, i.e. for the reverse reaction:

#H_2O(g) stackrel("condensation of water")rarrH_2O(l)+Delta#

Do you think this energy could be used to drive an engine? Choo-Choo?

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