How many kilojoules are required to change 85g of water at 25 C to steam at 100 C?

Answer 1

q1 = heat required to change T from 25 C to 100 c.
q1 = mass H2O x specific heat water x delta T.
q2 = heat required to change liquid water at 100 C to steam at 100 C.
q2 = mass H2O x heat vaporization

total heat = q1 + q2.