Molar heat Capacity at Constant Pressure

# Molar heat Capacity at Constant Pressure - T if we assume a...

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Molar heat Capacity at Constant Pressure Suppose that, while heat is added to the system, the volume is changed such that the gas pressure does not change. Again, the change in the internal energy of the system is given by where C p is the molar heat capacity at constant pressure . This expression can be rewritten as For an ideal gas (pV = nRT) we can relate V to
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Unformatted text preview: T, if we assume a constant pressure ∆ ∆ Using this relation, the first law of thermodynamics can be rewritten as or However, the internal energy U depends only on the temperature and not on how the volume and/or pressure is changing. Thus, U/ T = 3/2 n R = n C ∆ ∆ V . The previous equation can therefore be rewritten as or We see that C p C ≠ V ....
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