# balance them by adding up the atoms, rather use

1. (25 pts) (A) Fill in the correct number of H 2 (electron pairs) to balance the following equations. Do notbalance them by adding up the atoms, rather use the Tables 2 and 3 in the Appendix 2. Show which equationwas used, and what the ∆G°’ for the reaction is.Eqn # Table#∆G°’1. EthanolAcetaldehyde + ____ H2Acetate- + ____H2 + H+2. Acetaldehyde + H2O3. Butyrate- + ____H2 + H+Butanol + H2O4. HCO3- + ____ H2 + H+CH4 + 3H2O5. 2HCO3- + ____H2 + H+Acetate-+ 4H2O6. N2 + 2H+ + ____H22 NH4+7. S° + ____H2HS- + H+8. HS- + 4H2OSO42- + H+ + ____H29. NH4+ + 2H2ONO2- + 2H+ + ____H2.10. O2 + ____H22H2O(B) Draw the products of ethanol oxidation in Equations 1&2, acetaldehyde and acetate. Keep the most reducedcarbon on the left when you draw them.OHH3CCHHEthanolAcetaldehydeAcetateFrom the figure in the redox handout, put the appropriate Eo’ values over the arrows.Also looking at the redox table, predict whether the reactions can reduce NAD + to NADH and put a yes or noover the arrows to denote this.BIOMI 41402Homework Assignment2. (25 pts). The equation for the oxidation of glucose to CO2 is:Glucose + 12 H2O 6 HCO3- + 6 H+ + 12 H2∆Go’= +3.2 kJ/rxn(A) Using Tables 2 and 3 in Appendix 2, calculate the ∆G°’ available to organisms (or groups of organisms)oxidizing glucose to CO2 (one half-reaction) and reducing the following electron acceptors to the followingproducts (the other half-reaction):(a). acceptor O2; product H2O (this was done on p3 of Appendix 2)(b). acceptor: HCO3-; product: CH4 (Hint: remember to balance the "H2s")(c). acceptor S°; product: HS-(d). acceptor SO42-; product: HS-(e). acceptor NO3-; product: NH4+(f). acceptor HCO3-; product: CH3COO-(g). Place acceptor combinations (a-f) in order of the potential amount of energy they provide for theorganisms carrying them out (highest first):_____________________________.2 (B). Looking at the electron tower figure in Appendix 3 of your handout, predict the order of energyavailable for organisms to conserve using the electron accepting reactions in part A. Do the predictions agree?_____________________________.3. (20 pts) A scientist is interested in whether it is possible for the herbicide 2,2 dichloropropionate (Dalapon) to bedechlorinated to propionate under anaerobic conditions. This will help predict whether this compound wouldpersist in flooded soils. The scientist couldn’t find a free energy of formation for this compound, however, (s)he did find that another alkyl halide, CH 3C1 had a ∆Gf of -48.6 kJ/mol and used the ∆G f values in Table 1 inAppendix 2 to calculate the free energy of its dehalogenation to methane.Calculate the ∆G°’ in kJ for the model dechlorination reaction:H2 + CH3C1 CH4 + H+ + C1-(b) Now calculate the ∆G’ for the reaction when the products and reactants are at concentrations typical offlooded soil:BIOMI 41404Homework AssignmentH2 = 10-4 atm, CH3C1 = 10-5 M, CH4 = 0.1 atm; C1- = .01 M4. (30 pts) The S organism carries out of the reaction:Ethanol + H2O Acetate- + H+ + 2H2 ∆G°’ = + 9.6 kJ/rxn(a) When ethanol at 0.01 M and H2 at 10-1 atm, calculate the ∆G’ values when the acetate concentration is10-1 (= 0.1) M, 10-2 M, 10-3 M, 10-4 M and 10-5 M. (Hint: this problem was solved for H 2 inAppendix 2). Please show calculations.Answers:10.1 M,10.2 M10.3 M10.4 M10.5 M(b) On the graph below, plot a graph in which the x axis is logarithmic and represents the acetateconcentration and the y axis is the ∆G’ value. What is the change of the ∆G’ value for every 10-folddecrease in acetate concentration?

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