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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