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I think both Cv and Cp can be used to calculator enthalpy change in the formula q= nCT. Just know that Cv means the molar heat capacity of a gas at a constant volume whereas Cp means the molar heat capacity of a gas at a constant pressure.
Leila_4E wrote:Do solids and liquids only use C? Or do they use Cv? I'm pretty sure they don't use Cp.
They are the same for solids and liquids. For gasses, they are easily compressible, meaning their specific volume can easily change, while solids and liquids cannot change volume that easily so we just say that Cv=Cp.
The values are the same in solids and liquids. In gases, Cv is constant volume and Cp is constant pressure so the values will be different. I think Cp may be used because Cp calorimetry gives enthalpy values, whereas Cv calorimetry gives heat capacity of the whole container/all parts
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