lecture11_042207

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

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Entropy More states with larger volume,
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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.
Background image of page 2
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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

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.

Page1 / 7

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

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online