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Standard Enthalpy of Formation

Posted: Thu Jan 14, 2016 2:45 pm
by KarenaKaing_1D
Lavelle writes in his course reader that the standard enthalpy of formation of an element in its most stable form is zero. He also mentions later in the example that oxygen gas is in its most stable form. How do you know if an element is in its stable form or not?

Re: Standard Enthalpy of Formation

Posted: Thu Jan 14, 2016 5:48 pm
by Nikhil Davuluri 2A
For most elements, the most stable form is just a single atom. However, some elements are most stable in a diatomic for such as hydrogen, nitrogen, fluorine, oxygen, iodine, chlorine, bromine. I think you just have to memorize which elements are most stable in a diatomic form.

Here is a nice mnemonic I found on the internet

Have No Fear Of Ice Cold Beer

Hope this helps :)