1.

Which of the following reactions defines DeltaH_(f)^(@)?

Answer»

`C_("(diamond)")+O_(2)(g) rarr CO_(2)(g)`
`1//2 H_(2)(g)+1//2 F_(2)(g) rarr HF(g)`
`N_(2)(g)+3H_(2)(g) rarr 2NH_(3)`
`CO(g)+1//2O_(2)(g) rarr CO_(2)(g)`

Solution :(A) Defines correct `DeltaH_(f)^(@)` if diamond replaces by graphite.
(D) Only elementary must be PRESENT on reactant sides.


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