1) Write the half reaction for the formation of Co-(e) from CHa(g).Include all p

Question

1) Write the half reaction for the formation of Co-(e) from CHa(g).Include all protons and electrons. 2) Write the half reaction for the formation of water from the addition of O2 and H 3) Combine both reactions with CO2(g) as a product and O2 as a reactant. 4) Calculate ?So for the reaction. 5) Calculate ??? for the reaction. 6) Calculate AG° for the reaction. 7) Assume equilibrium and calculate the equilibrium constant K. 8) Calculate ?G for the reaction for ambient aerobic atmospheric CO2(g) and O2(g) concentrations and a CH4(g) concentration of 102 M. 108 M thermodynamically favorable? 9) Calculate ?@for the reaction under anaerobic conditions when the O2(g) becomes 10) Compare the results between aerobic and anaerobic conditions. Which is more 2

Explanation / Answer

(1)The half reaction for formation of CO2(g) from CH4 is CH4+O2 = CO2+2H2

But the hydrogen will be also combusted in reaction:

2H2+O2 = 2H2O

The overall reaction is CH4 + 2O2 = CO2 + 2H2O

(2) The half reaction for formation of water from the addition of O2 and Hdrogen ion as follows

1st half reaction O2 + 4H3O+ +4e = 6H2O (REDUCTION OF OXYGEN)

2nd half reaction 2H3O+ + 2e = H2 + 2H2O

(3) Redox potenials are related to gibbs free energy

change in free energy = -nfEo

change in free energy = -4* 96.49*1.22 kj mol-

change in free energy = -474.3kj/mol

the enthalpy of reaction is -571.66 kj/mol and entropy is -326.8 jk-

(7) the relationship between change in free energy and equilibrium constant is

change in free energy = -2.303logK

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