Homework 8 Key

Homework 8 Key - CHEMISTRY 201X: Homework #8...

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CHEMISTRY 201X: Homework #8 Due : Thursday, November 15, 2007 “Thermodynamics” For each of the following reactions as described in words, (a) (2 pts) Write the balanced chemical equation; (b) (2 pts) Draw the Lewis structures for each underlined species; (c) (2 pts) Calculate H ° and S ° ; (d) (4 pts) Calculate G ° and K p at 298 K and estimate them at 798 K; (e) (2 pts) Write down the expression for the equilibrium constant, K p . (1) (12 pts) Calcium carbide(s) is produced by the reduction of calcium oxide(s) with carbon(s) at high temperatures. Carbon dioxide (g) is another product of the reaction. 2 CaO(s) + 5 C(s) ⎯→ 2 CaC 2 (s) + CO 2 (g) H ° = [2( 62.8) + ( 393.5)] [2( 635.5) + 5(0)] = +751.9 kJ S ° = [2(70.3) + (213.6)] [2(40.0) + 5(5.7)] = +245.7 J/K = +0.2457 kJ/K G ° (298 K) = (+751.9 kJ) (298 K)(+0.2457 kJ/K) = +678.7 kJ K p (298 K) = 7.50 × 10 122 G ° (798 K) = (+751.9 kJ) (798 K)(+0.2457 kJ/K) = +555.8 kJ K p (798 K) = 2.72 × 10 39 K p = p (CO 2 ) OCO (2) (12 pts) Solid ammonium nitrate, when heated, decomposes into gaseous dinitrogen monoxide and water vapor.
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This homework help was uploaded on 03/27/2008 for the course CHEM 201 taught by Professor Miller during the Fall '07 term at Iowa State.

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Homework 8 Key - CHEMISTRY 201X: Homework #8...

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