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The oxidation of glucose to carbon dioxide and water is repr

The oxidation of glucose to carbon dioxide and water is represented by the following reaction, wheth… Show more The oxidation of glucose to carbon dioxide and water is represented by the following reaction, whether the oxidation occurs by combustion in the laboratory or by biological oxidation in living cells: C6H12O6 + 6O2 = 6CO2 + 6H2O (This is a reversible reaction. Occurs both in the forward and reverse reaction) This reaction is highly exothermic, with an enthalpy change (∆H) of –673 kcal/mol. As you know from Figure 5-9, ΔG for this reaction at 25°C is –686 kcal/mol, so the reaction is also highly exergonic. (a) Explain in your own words what the ∆H and ∆G values mean. What do the negative signs mean in each case? (b) What does it mean to say that the difference between the ∆G and ∆H values is due to entropy? (c) Without doing any calculations, would ∆S for this reaction be positive or negative? Explain your answer. (d) Now calculate ∆S for this reaction at 25°C. Does the calculated value agree in sign with your prediction in part c? (e) What are the values of ∆G, ∆H, and ∆S for the reverse of the above reaction as carried out by a photosynthetic algal cell that is using CO2 and H2O to make C6H12O6? • Show less

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