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Unformatted text preview: again tripled. d. The gas is finally reversibly cooled to 300 K at constant pressure. 3.4 Calculate the change in the enthalpy and the change in entropy when 1 mole of SiC is heated from 25 C to 1000 C. The constant pressure molar heat capacity of SiC varies with temperature as c p = 50.79 + 1.97 * 10-3 T 4.92 * 10 6 T-2 + 8.20 * 10 8 T-3 J/mole-K 3.5 One mole of copper at a uniform temperature of 0 C is placed in thermal contact with a second mole of copper which, initially, is at a uniform temperature of 100 C. Calculate the temperature of the 2 mole system, which is contained in a adiabatic enclosure, when thermal equilibrium is attained. Why is the common uniform temperature not exactly 50 C? How much heat is transferred, and how much entropy is produced by the transfer? The constant pressure molar heat capacity of solid copper varies with temperature as c p = 22.64 + 6.28 * 10-3 T J/mol-K...
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- Fall '11