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Which of the following has zero value fo...

Which of the following has zero value for `D_(f) H^(@)`?

A

`O_(3) (g)`

B

`O (g)`

C

`O_(2) (g)`

D

`O_(2) (l)`

Text Solution

Verified by Experts

The correct Answer is:
C
By convention, the `Delta_(f) H^(@)` value for any elements in its standard state is zero. The standard state of oxygen, i.e., the most stable pure of oxygen at 1 bar pressure and at `25^(@)C` is `O_(2) (g)`.
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