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At 25^(@)C and 1 atm, standard reaction ...

At `25^(@)C` and 1 atm, standard reaction enthalpy for the reaction, `CH_(4)(g) +2O_(2)(g)toCO_(2)(g)+2H_(2)O(l)` is _____ of `CH_(4)(g)`.

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Standard enthalpy of combustion.
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