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I've found that most problems we deal with have to do with temperature change; you will then use Cv because it is the pressure that is changing with the system rather than the volume (even if there is volume expansion occuring but that will be taken into account with a different equation). You will use Cp generally when the problem itself explicitly states that there is a constant pressure with the ideal gas.
Going off of what Sophia said, unless there is something in the problem that explicitly states that pressure is constant, you will always use the Cv constant because we can't assume that pressure is constant when nothing within the problem mentions pressure.
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