Ammonia is a molecule essential to life on earth. At this time, ammonia Is synth

Question

Ammonia is a molecule essential to life on earth. At this time, ammonia Is synthesized from atmospheric nitrogen by the very efficient, FeS-containing nitrogenase enzyme. Before this enzyme evolved, It is believed that ammonia may have been produced with the inorganic material, FeS, In the reaction shown below. N_2+ 3 H_2S + 3 FeS = 2 NH_3 + 3 FeS_2 Determine AG for this reaction at room temperature(25DegreeC). I kJ/mol Determine the cell potential, E Degree. Determine the equilibrium constant. Is ammonia production increased or decreased at higher temperatures increased no change decreased

Explanation / Answer

N2+3H2S +3FeS <===> 2NH3+3FeS2

a) DG0= 2*DG0fNH3+3*DG0fFeS2 - DG0fN2 + 3*DG0fH2S+3*DG0fFeS

    = ((2*-16.48)+(3*-166.94)) - (0+3*-33.05+3*-100.42)

   = -133.37 Kj

b) DG0 = -nFE0cell

-133.37*10^3 = -6*96500*E0cell

E0cell = 0.23 V

c) DG0 = -RTlnk

-133.37*10^3 = -8.314*298lnk

k = 2.39*10^23

d) increases

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