Answer:
56500J
 
Step-by-step explanation:
Given parameters: 
Mass of water = 25g = 0.025kg
Temperature of the water = 100°C
Unknown: 
Amount of heat required to vaporize the water = ?
Solution: 
The amount of heat required to vaporize the water is a function of the mass of the water and the latent heat of vaporization of water. 
 H = mL 
H is the amount of heat 
m is the mass 
L is the latent heat of vaporization of water = 22.6 x 10⁵J/Kg 
 H = 0.025 x 22.6 x 10⁵ = 56500J