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The species which by definition has zero standard molar enthaly of formation at `298K` is `:`

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The species which by definition has zero standard molar enthaly of formation at `298K` is `:`
A. `CO_(2)(g)`
B. `H_(2)O(l)`
C. `O_(2)(g)`
D. `P_(4)(`red)
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Standard molar enthalpy of formation `(DeltaH_(f)^(@))` of element in their stable state of agregation is zero.
`:. " "DeltaH_(f)^(@)(O_(2),g)=0`
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