1.

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

Answer»

`Br_(2)(g)`<BR>`Cl_(2)(g)`
`H_(2)O(g)`
`CH_(4)(g)`

Solution :`DeltaH_(f)^(@)(Cl_(2),g)=0, " As "DeltaH_(f)^(@)` of elements in their STANDARD state is taken to be zero.


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