including phase changes

[annikaying]

How can you tell when you have to include the energy required for a phase change in a reaction?

[Wilson 2E]

If a phase change does occur in the problem, the enthalpy of fusion/vaporization should be given (so long as it's not water, the values of which are on the formula sheet), which should indicate that you would need to include phase change calculations.

[005321227]

usually the phase change will be given in the question and you just apply it as needed