Ch. 17 - Chemical ThermodynamicsWorksheetSee all chapters
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Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: The U.S. government now requires that automobile fuels consist of a renewable component. One such biofuel, ethanol, may be produced by fermentation of the glucose, C6H12O6(s), from feedstocks such as corn and sugar cane: C6H12O6(s) → 2 C2H5OH(l) + 2 CO2(g) Given the following thermodynamic data, what is the standard Gibbs free energy change for the above reaction at 298 K?                          ΔHf° (kJ·mol  –1 )           S°(J·K –1 ·mol –1 ) C6H12O6(s)        -1274.5                        212.7 C2H5OH(l)          -277.7                         160.7 CO2(g)               -393.5                          213.7 (a) –92.0 kJ (b) –228 kJ (c) –19.5 kJ (d) –116 kJ (e) 92.0 kJ

Problem

The U.S. government now requires that automobile fuels consist of a renewable component. One such biofuel, ethanol, may be produced by fermentation of the glucose, C6H12O6(s), from feedstocks such as corn and sugar cane:

C6H12O6(s) → 2 C2H5OH(l) + 2 CO2(g)

Given the following thermodynamic data, what is the standard Gibbs free energy change for the above reaction at 298 K?

                         ΔHf° (kJ·mol  –1 )           S°(J·K –1 ·mol –1 )
C6H12O6(s)        -1274.5                        212.7
C2H5OH(l)          -277.7                         160.7
CO2(g)               -393.5                          213.7

(a) –92.0 kJ

(b) –228 kJ

(c) –19.5 kJ

(d) –116 kJ

(e) 92.0 kJ