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Explain the two specific heats of gas? Show that the difference between two specific heats is equal to the Universal gas constant. |
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Answer» Apply first law of thermodynamics. Heat added = increase in internal energy + external work done by the system ∴ dQ = du+dw Specific heats of gases are expressed as molar specific heats which are constant pressure Cp and constant volume Cv. From enthalpy, H = u + Pv Relationship between specific heats for ideal gases be written as H = u + Pv dh = du + d(RT) Cpdt = Cvdt + Rdt Cp = Cv + R or R = Cp - Cv where R is gas constant |
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