2 3 attempts left Check my work Be sure to answer all parts. Report problem In t

Question

2 3 attempts left Check my work Be sure to answer all parts. Report problem In the process of respiration, glucose is oxidized completely. In fermentation, O2 is absent, and glucose Guided Solution is broken down to ethanol and CO2. Ethanol is oxidized to CO2 and H20 (a) Balance the following equations by adding the appropriate coefficients: Respiration:CHI2os)+02K)- Fermentaton: CH12-C2HOH) + CO202) Ethanol oxidation:C2HsOH02CO2H20() H200 0 (b) Calculate ?G for respiration of 1.00 g of glucose. rxn kJ (c) Calculate ?G for fermentation of 1.00 g of glucose. rxn k.J (d) Calculate ?G. for oxidation of the ethanol from part (c). rxn kJ/g

Explanation / Answer

Part a

Respiration reaction

C6H12O6 + 6O2 = 6CO2 + 6H2O

Fermentation reaction

C6H12O6 = 2 C2H5OH + 2CO2

Ethanol oxidation

C2H5OH + 3 O2 = 2 CO2 + 3H2O

Part b

Gibbs free energy change of reaction of Respiration reaction

G°rxn = sum of Gibbs free energy of formation of products - sum of Gibbs free energy of formation of reactants

= 6*Gf°(H2O) + 6*Gf°(CO2) - 6*Gf°(O2) - 6*Gf°(C6H12O6)

= 6*(-237.2 kJ/mol) + 6*(-394.4 kJ/mol) - 6*(0) - 6*(-910.56 kJ/mol)

= 1673.76 kJ/mol x 1mol/180.156g x 1g

= 9.29 kJ

Part c

Gibbs free energy change of reaction of Fermentation reaction

= 2*Gf°(C2H5OH) + 2*Gf°(CO2) - Gf°(C6H12O6)

= 2*(-174.18 kJ/mol) + 2*(-394.4 kJ/mol) - (-910.56 kJ/mol)

= -226.6 kJ/mol x 1mol/180.156g x 1g

= - 1.257 kJ/g

Part d

Gibbs free energy change of reaction of Ethanol oxidation

= 3*Gf°(H2O) + 2*Gf°(CO2) - 3*Gf°(O2) - Gf°(C2H5OH)

= 3*(-237.2 kJ/mol) + 2*(-394.4 kJ/mol) - 3*(0) - (-174.18 kJ/mol)

= - 1326.22 kJ/mol x 1mol/46g

= - 28.83 kJ/g

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