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(a) At 25^(@)C, standard reaction enthal...

(a) At `25^(@)C`, standard reaction enthalpy for the reaction 2 C(graphite, s) `+O_(2)(g)to 2CO(g)` is `-221.0` kJ. Does this value indicate the standard enthalpy of formation of CO(g) ? If not, then what would be the value of enthalpy of formation of CO(g) at `25^(@)C` ?
(b) A gas is allowed to expand against zero external pressure. Explain with reason whether the procss is reversible or not.

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