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I would think that there would be certain vocabulary used to indicate if the problem were a phase change problem, such as vaporization, fusion, or sublimation. In the case of water, we also know the temperatures at which the phase changes occur (0C/32F, 100C/212F), so if the temperature were to pass one of these values we would know that a phase change had occurred, or if words were used such as liquid in one part of the problem and vapor later. If the enthalpies of any of the phase changes were given, it would also be a clear indicator of the type of problem.
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