Answer
145.161 g
Work Step by Step
1 watt = 1 J/s
100 watt = 100 J/s
1 hr = 3600 sec
100 X 3600 = 360000 J of energy per hour
Enthalpy of vaporization for water = 44.66 kJ/mol
44.66 kJ/mol = 44.66/18 = 2.48 kJ/g
1 g of water can be evaporated by 2.48 kJ of heat.
So, 360000 J/2480 = 145.161 g of water