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The species which by definition has zero...

The species which by definition has zero standard molar enthalpy 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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The correct Answer is:
3
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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