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EO_440_PS6_F11 - Calculate the standard reaction entropy at...

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Chem 440 Fall 2011 Problem Set 6 DUE: Thursday, November 10, 2011 1. Calculate the change in entropy when 50 kJ of energy is transferred reversibly and isothermally as heat to a large block of copper at a) 0˚C b) 70˚C 2. Calculate the molar entropy of a constant-volume sample of argon at 250 K given that it is 154.84 J K -1 mol -1 at 298 K. 3. Calculate S (for the system) when the state of 2.00 mol of a diatomic perfect gas, for which C p,m = 7 2 R, is changed from 25˚C and 1.50 atm to 135˚C and 7.00 atm. How do you rationalize the sign of S? Hint: Sum of reversible heating at constant P and reversible isothermal compression). 4. A sample of copper of mass 2.75 kg is cooled at constant pressure from 330 K to 275 K. Calculate a) the energy that must be removed as heat and b) the change in entropy of the sample. 5.
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Unformatted text preview: Calculate the standard reaction entropy at 298 K of a) Zn(s) + Cu 2+ (aq) → Zn 2+ (aq) + Cu(s) b) C 12 H 22 O 11 (s) + 120 2 (g) → 12CO 2 (g) + 11H 2 O(l) USE TABLES/WEB. 6. Calculate the change in the entropies of the system and the surroundings, and the total change in entropy, when the volume of a sample of argon gas of mass 21 g at 298 K and 1.50 bar increases from 1.20 L to 4.60 L in a) an isothermal reversible expansion, b) an isothermal irreversible expansion against p ex = 0, and c) an adiabatic reversible expansion. 7. The heat capacity of chloroform (trichloromethane, CHCl 3 ) in the range 240 K to 330 K is given by C p,m /(J K-1 mol-1 ) = 01.47 + 7.5 x 10-2 (T/K). In a particular experiment, 1.00 mol CHCl 3 is heated from 273 K to 300 K. Calculate the change in molar entropy of the sample....
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