How much heat is required to vaporize 80.6 g of water at 100 C? The heat of vaporization of water at 100 C is 40.7 kJ/mole.?
The heat being added to a substance during a phase change does not raise the Temperature, instead, it's being used to break the bonds in the solution.
So, to answer the question, you must convert grams of water to moles.
Now, multiply moles by the heat of vaporization,
This is the amount of heat applied to water to completely break the bonds between water molecules so it can completely vaporize.