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Compute the standard free energy of the ...

Compute the standard free energy of the reaction at `27^(@)C` for the combustion of methane using the given data.
`CH_(4)(g)+2O_(2)(g)to CO_(2)(g)+2H_(2)O(l)`
`{:("Species",CH_(4),O_(2),CO_(2),H_(2)O),(Delta_(f)H^(@)//(kJ mol^(-1)),-74.8,-,-393.5,-285.8),(S^(@)//(JK^(-1)mol^(-1)),186,205,214,70):}`

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