Physics question calculate the energy required to vaporise 50kg of water initially at 80c

Answer 1

raise it from 80 to 100 C heat energy in = C m (100 - 80)
C = specific heat of water
m = mass (watch units of C, probably use 50,000 grams)
vaporise it. heat energy in = K m
K = heat of vaporization of water
add those two energies