how many calories are needed to convert 20.0g of water at 25 Celsius to steam at 100 Celsius?

1 answer

q1 = heat needed to convert water at 25 to water at 100
q1 = mass x specific heat H2O x (Tfinal-Tinitial)
(Note:) Tf is 100; Ti is 25

q2 = heat needed to convert H2O to steam.
q2 = mass H2O x heat vaporization.

qtotal = q1 + q2