posted by Katelyn .
H2O (liquid) yields H2O gas delta H= +44kJ.
How much heat is evolved when 9.0 grams of water vapor is condensed to liquid water?
Reverse the equation to be H2O (g) --> H2O (l) delta H= -44kJ
There are 9.0 grams of H2O (g)
Find moles of the gas: 9.0/16= .50 moles
44 times .50 =22 kJ evolved