H2o has a mc021-1.jpghvap = 40.7 kj/mol. what is the quantity of heat that is released when 27.9 g of h2o condenses?
a)60.00 kj
b)61.05 kj
c)63.09 kj
d)68.60 kj

Energy released from changing the phase of a substance from the gas phase to liquid phase can be calculated by using the specific latent heat of vaporization. The heat of fusion of water at 0 degrees Celsius is 40.7 kJ/mol. Calculation are as follows: 

Energy = 27.9 g (1 mol / 18.02 g) x 40.7 kJ/mol

Energy = 63.09 kJ