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This is somewhat of a broad question that I am not entirely sure how to phrase correctly. In some instances with calculations involving reactions it is necessary to include when a solid or liquid changes to a gas if the product it forms is also a gas, but sometimes you don't. When do you know when to incorporate the phase change in the calculations?
I guess like the example seen on the practice midterm from the review session today, some questions will explicitly state that calculating a phase change is not required, while others will state that you are going from liquid to gas which implies that you need to include the phase change (although the example used today was from a solid to a liquid).
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