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Cv or Cp may be specified, but if not you want to be aware of the other factors acting on the system. Cv is molar heat capacity at constant volume, so if your system is in a sealed container, you would use that one. If your system is at constant pressure, like an open container or with a piston, you would use Cp. Hope that helps!
If Cv or Cp is not specified, it helps to know that Cv (molar heat capacity of a gas at constant volume) often uses a bomb calorimeter in which the volume remains constant and there is pressure buildup, hence the name. Cp (molar heat capacity of a gas at constant pressure) uses a constant pressure calorimeter in which the volume can change and enthalpy values are given.
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