Standard enthalpy of formation of O2

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Petrina Kan 2I
Posts: 102
Joined: Fri Aug 30, 2019 12:17 am

Standard enthalpy of formation of O2

Postby Petrina Kan 2I » Sun Jan 26, 2020 6:33 pm

Why is the standard enthalpy of formation of O2 0? I don't believe I caught the reason why in class.

Kimberly Koo 2I
Posts: 99
Joined: Sat Aug 17, 2019 12:17 am

Re: Standard enthalpy of formation of O2

Postby Kimberly Koo 2I » Sun Jan 26, 2020 6:56 pm

The standard enthalpy of O2 is 0 since the reaction goes from O2-->O2, the O2 is already in its most stable form

MaggieHan1L
Posts: 100
Joined: Thu Jul 11, 2019 12:17 am

Re: Standard enthalpy of formation of O2

Postby MaggieHan1L » Sun Jan 26, 2020 9:18 pm

02 is already the most stable form of oxygen and so if you look at 02 to 02 the enthalpy of formation would be enthalpy of 02-enthalpy of 02 equaling 0

Megan Vu 1J
Posts: 101
Joined: Thu Jul 25, 2019 12:15 am

Re: Standard enthalpy of formation of O2

Postby Megan Vu 1J » Mon Jan 27, 2020 2:06 pm

O2 is already in it's most stable form, so this is why the enthalpy is only 0. We stated in the additional comments that the bond enthalpies of diatomic molecules are accurate and measured for those molecules.

Because the reaction goes from O2 to O2, it is already stable, making it zero.

Jainam Shah 4I
Posts: 130
Joined: Fri Aug 30, 2019 12:16 am

Re: Standard enthalpy of formation of O2

Postby Jainam Shah 4I » Tue Jan 28, 2020 12:08 am

The O2 in its diatomic form is the most stable it can be which is why the standard enthalpy of formation is zero.


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