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For which of the following processes doe...

For which of the following processes does the enthalpy change represent the enthalpy of formation of `NaOH`?
`Na^(+)(aq)+OH^(-)(aq)rarr NaOH(s)`
`Na(s)+(1)/(2)O_(2)(g)+(1)/(2)H_(2)(g)rarr NaOH(s)`
`2Na(s)+2H_(2)O(1)rarr2NaOH(aq)+H_(2)(g)`
All of these

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