Posted by JoJo on Tuesday, April 10, 2012 at 3:27pm.
When you are moving within a phase (for example, liquid water at one T to liquid water at another T OR ice at one T to ice at another T OR steam at one T to steam at another T), the equation to use is
q = mass x specific heat of the substance in that phase x (Tfinal-Tintial).
When you are at the phase change point (ice or liquid water at zero C) the formula is
q = mass x heat fusion. + if ice to liquid or - if liquid to solid.
When you are at the phase change point at the other end (liquid water or steam at 100 C) the formula is
q = mass x heat vaporization. + if liquid to steam or - if steam to liquid.
In the problem above it is
q = mass x heat fusion
q = 10 g x 334 J/g = 3340 J. Since the ice is absorbing heat it is + 334 J.
Thanks so much DrBob222. This helped a bunch!
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