# 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

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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