Homework 8 - monoxide and water vapor. (3) (12 pts) One...

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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) (12 pts) Solid ammonium nitrate, when heated, decomposes into gaseous dinitrogen
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Unformatted text preview: monoxide and water vapor. (3) (12 pts) One method to prepare pure silicon(s) for semiconductor applications is to reduce gaseous silicon tetrachloride with hydrogen gas. Hydrogen chloride is another product of the reaction. Substance ( T = 298.15 K) f H ∆ (kJ/mol) S (J/mol ⋅ K) Calcium carbide(s) − 62.8 70.3 Calcium oxide(s) − 635.5 40.0 Carbon(s) -- 5.7 Carbon dioxide(g) − 393.5 213.6 Ammonium nitrate(s) − 365.6 151.1 Dinitrogen monoxide(g) 82.1 219.7 Water(g) − 241.8 188.7 Silicon(s) -- 18.8 Silicon tetrachloride(g) − 657.0 330.6 Hydrogen(g) -- 130.6 Hydrogen chloride(g) − 92.3 186.8...
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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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