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Consider an isolated system that contains two pieces of copper sepa- rated by an (internal) insulating wall. Initially, the first piece is at 500K and the second is at 300K. Calculate the entropy change in the sys- tem when the insulating wall is removed; assume that each piece has half a mole of copper in it. Given: Specific heat capacity of Cu is CP = 22.6JK−1mol−1 . [Hint: S is an extensive state function]. (b) What is the entropy change of the universe ? Comment whether the process is reversible/irreversible ? (c) Repeat your calculations for a molar heat capacity which is a function of T: CP = 22.6 + 6.28e − 03 T Jmol−1 K−1 . How does the equilibrium T change for such a CP ? Can you justify it ?
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