Question

is enthalpy of atomization of diatomic gas the energy released in breaking one mole of bonds or is it the energy released in formation of one mole of gaseous atoms

Answer 1

Atomization means converting a diatomic molecule into its two constituent atoms. This would involve breaking the bond that holds them together, thus releasing the energy that was stored in it. Whether its per mole of gas or per mole of atom must be specified - if it doesn't say in your question, it most likely is referring to mole of diatomic gas.

Answer 2

my doubt is :- is it h2-->2h+ or 1/2h2--> h+

Answer 3

I would go with h2-->2h+ if it's not obvious from the question

Answer 4

thanks so there is no particular standard rule to follow in this scenario. "web elements" gave all its value's per mole of a atom and wiki has said it is the energsy released in formation of 1 mole of gaseous atom and my text book states that it is breaking one mole of bonds so that confused me. http://www.webelements.com/periodicity/enthalpy_atomisation/, http://en.wikipedia.org/wiki/Enthalpy_of_atomization, and page 18 of http://webcache.googleusercontent.com/search?q=cache:WDZAcw5a7-sJ:www.iasexams.com/NCERT-Books/NCERTBooksforClass11/FreedownloadClass11Chemistry1NCERTBook/Class11_Chemistry1_Unit06_NCERT_TextBook_EnglishEdition.pdf+ncert+thermochemistry&cd=6&hl=en&ct=clnk&gl=in&source=www.google.co.in

Answer 5

If it's per one mole of bonds broken as your textbook says, then it's per one mole of diatomic atom if we're talking about H2; each molecule contains only one bond, so a mole of molecules contains a mole of bonds.

Answer 6

thanks