Posted by Julia on Tuesday, February 22, 2011 at 10:16pm.
I can't help because I'm confused by the problem. How can you have ice at 15 C? You can't. You must have made a typo; I suspect it is -15 C.
Here is the general procedure.
For change of state (change of phase), heat needed is
q = mass x heat fusion (if melting/freezing) or heat of vaporization (if vaporizing/condensing) and if moving within a phase (the same state)
q = mass x specific heat x (Tfinal-Tinitial).
Then total Q = sum of individual qs.
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