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There are also some tricky ways that constant pressure or volume can be hinted at in the problem. For example, the question might not say constant pressure, but give you a value for enthalpy which in itself implies constant pressure. There are also problems where you have to split the entropy change into two steps and assume that either pressure or volume stay the same while you're making the temperature change calculation.
Always look at the context of the question. If you are having trouble determining which one is constant, go back to the basics. Like stated above, sometimes you may have to split the entropy change into several steps, which works since entropy is a state function.
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