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PS10_Key

# PS10_Key - Chemistry 2080 Spring 2009 Problem Set#10 due...

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Chemistry 2080 Spring 2009 Problem Set #10 - due date: Friday, April 24th at 2 pm Name:_______ KEY______ Lab TA Name:__________________ Lab Day/Time:______________________ Practice problems (not graded). Chapter 19 : 7, 15, 17, 22, 23, 31, 35, 39, 53, 63 1) Iron(III) oxide can be reduced with carbon monoxide to make metallic iron. The carbon monoxide becomes oxidized to carbon dioxide: Fe 2 O 3 (s) + 3CO(g) –––––> 2Fe(s) + 3CO 2 (g) We have the following values of Δ f and S° for the four components of this reaction: Fe 2 O 3 (s) CO(g) Fe(s) CO 2 (g) Δ f {kJ/mol} -824.2 -110.5 0 -393.5 {J/(K.mol)} +87.40 +197.7 +27.28 213.7 a) Calculate the standard free-energy change for the above reaction at 25°C. b) Would the reaction as written be spontaneous under standard-state conditions at 25°C ? c) Calculate the value of the equilibrium constant for the above reaction at 25°C. d) Would the reverse reaction become spontaneous at higher temperatures? (a) The value of Δ H° for the reaction can be calculated from: Δ = [2 Δ f (Fe) + 3 Δ f (CO 2 ) ] [1 Δ f (Fe 2 O 3 ) + 3 Δ f (CO)] = [(2mol)(0kJ/mol) + (3mol)(-393.5kJ/mol)] [(1mol)(-824.2kJ/mol) + (3mol)(-110.5kJ/mol)]

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