Calculate the standard Gibbs free energy change of the following reaction: CH4(g) + 8O2(g) --> CO2(g) + 2H2O(g) + 4O3(g) The standard free energies of formation at 250C are given below: Species  ΔG°f(kJ/mol) CH4(g)     -50.5 O2(g)          0.0 CO2(g)      -394.4 H2O(g)     -228.6 O3(g)            163.2 Group of answer choices +409.3 kJ/mol +148.3 kJ/mol -148.3 kJ/mol -409.3 kJ/mol Back

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