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zarlalopes77
The water molecules that are evaporationg absorb heat energy from the surrounding environment, which causes the evaporation. If 5 grams of water evaporate, then there will be 5 grams of water vapor in the air.
alexesmalia
Mass is conserved  as the water which evaporates appears, heat is needed for the evaporation is taken from a liquid and is conserved 
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