lecture11_042207

# lecture11_042207 - ∆ G = -38 kJ/mol Free energy and...

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Entropy More states with larger volume,

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Free energy and Spontaneity A chemical engineer wants to determine the feasibility of making ethanol (CH 3 CH 2 OH) by reacting water with ethylene (C 2 H 4 ) according to the equation C 2 H 4 (g) + H 2 O (l) CH 3 CH 2 OH (l) a) Is this reaction spontaneous at standard conditions? G°(C 2 H 4 (g) ) = 68 kJ/mol G°(H 2 O (l) ) = -237 kJ/mol G°(CH 3 CH 2 OH (l) ) = -175 kJ/mol Yes, spontaneous. b) Given that S° for the reaction is -128 J/mol, will the reaction become more or less spontaneous by increasing the reaction temperature? Less spontaneous. c) Is the spontaneous reaction driven by enthalpy or entropy? Driven by enthalpy.
Free Energy and Spontaneity For the reaction CO (g) + 2H 2 (g) CH 3 OH (l) Calculate G at 25°C where CO is at 5.0 atm and H 2 is at 3.0 atm. f (CO (g) ) = -137 kJ/mol f (H 2 (g) ) = 0 kJ/mol f (CH 3 OH (l) ) = -166 kJ/mol

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Unformatted text preview: ∆ G = -38 kJ/mol Free energy and non-standard conditions Consider the following reaction: H 2 O (g) + Cl 2 O (g) → 2HOCl (g) K = 0.090 a) Calculate ∆ G for the reaction. b) Calculate the equilibrium constant for the reaction at 500 K. a) 5.97 kJ/mol b) K= 0.238 Galvanic Cell Electrochemistry For the reaction: Zn (s) + 2HCl (aq) → ZnCl 2 (aq) + H 2 (g) , Define the oxidation reaction and the reduction reaction given. Also calculate E° cell given: Zn 2+ (aq) + 2e-→ Zn (s) E° = -0.76 V 2H + (aq) + 2e-→ H 2 (g) E° = 0 V E° cell = 0.76 V Electrochemistry Given the following reduction potentials, write the overall redox reaction and calculate E° cell . Cd 2+ /Cd E° = -0.0403 V Cu 2+ /Cu E° = 0.34 V E° cell = 0.743 V...
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## This note was uploaded on 05/18/2008 for the course CHEM 2080 taught by Professor Davis,f during the Spring '07 term at Cornell.

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lecture11_042207 - ∆ G = -38 kJ/mol Free energy and...

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