Chads GC videos: Question!

[toothhornet88]

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What did he mean about the mnemonic "Never Have Fear Of Ice Cold Beer" I know he was talking about 7 diatomic elements: Nitrogen, Hydrogen, Fluorine, Oxygen, Iodine, Chlorine, and Bromine-- but i forgot what he meant by that! can someone please remind me!!

 

[molecules05]

They're diatomic molecules.
Nitrogen, Hydrogen, Fluorine, Oxygen, Iodine, Chlorine, Bromine.

He was referring to them in talking about the Enthalpies of Formation. He mentions that formation reactions make exactly 1 mol of product form individual elements in their standard states. The standard states for the those molecules are in their "diatomic state."

So, Cl2 (g) ---> Cl2 (g) has an enthalpy of formation that equals 0.

Also - sorry for all the edits! My computer is spazzing and won't let me write this properly.