Question

You have 40.00 g of ice at -20.0C. You want ot convert all the ice to steam at 140.0 C. How much energy will it take to do so?

Answer 1

q1 = heat needed to raise T of solid ice from -20 to 0.
q1 = mass ice x specific heat ice x (Tfinal-Tinitial).

q2 = heat needed to melt the solid ice at zero to liquid at zero.
q2 = mass ice x heat fusion.

q3 = heat needed to raise T of liquid water from zero C to 100 C.
q3 = mass H2O x specific heat liquid H2) x (Tfinal-Tinitial)

q4 = heat needed to convert liquid water at 100 C to steam at 100 C.
q4 = mass water x heat vaporization.

q5 = heat needed to raise T of steam from 100 C to 140 C.
q5 = mass steam x specific heat steam x (Tfinal-Tinitial).
Total heat needed = q1 + q2 + q3 + q4 + q5.

Answer 2

Thanks DrBob222, I think I can figure this out now. I didn't know quite how to tackle this -- I appreciate it!