Assume that the pressure is one atmosphere and determine the heat in joules required to produce 3.23 kg of water vapor at 100.0 °C, starting with (a)3.23 kg of water at 100.0 °C and (b)3.23 kg of liquid water at 0.0 °C

Answer 1

a) q1 = heat needed to transform 100 C liquid water to 100 C steam.
q1 = mass water in grams x heat fusion

b)
q2 = heat needed to transform zero C liquid H2O to liquid water at 100 C.
q2 = mass H2O in grams x specific heat water x delta T (delta T is 100-0=100).

q3 = heat needed to vaporize the water
to steam.
q3 = mass H2O in grams x heat fusion.
For part b. total q = q2 + q3.

q2 = mass water x heat fusion.