1.

The species which by definition has ZERO standard molar enthalpy of formation at 298 K is

Answer»

`Br_(2)(g)`
`Cl_(2)(g)`
`H_(2)O(g)`
`CH_(4)(g)`

Solution :`Delta_(f)H^(@) = 0` for ELEMENTARY substances in standard STATE . `Br_(2)`is LIQUID in standard state.


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