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Cp is when a reaction is occurring at constant pressure and Cv is when a reaction is occurring at constant volume. The molar heat capacities of an ideal gas can be found on the Constants and Equations sheet where Cp= 5/2R and Cv=3/2R.
Cv refers to constant volume, whereas Cp refers to constant pressure. If anything, the problem may describe which one you're going to use depending on whether the system is described as isobaric(constant pressure) or Isometric (constant volume).
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