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ALL CIE CHEMISTRY DOUBTS HERE !!

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HUSH1994:

--- Quote from: Deadly_king on October 01, 2010, 05:37:26 pm ---rightly said Twinkle :)
+rep

--- End quote ---
Thank You twinkle,+rep as well ;)

ruby92:
given that the bond energy needed to break an O2 bond is 150 what is thae standard enthalpy of atomisation?

Deadly_king:

--- Quote from: ruby92 on October 03, 2010, 04:45:14 pm ---given that the bond energy needed to break an O2 bond is 150 what is thae standard enthalpy of atomisation?

--- End quote ---
According to your statement, when breaking the O2 molecules, we get 2 oxygen atoms. For this 150KJ/mol energy is required. (Bond energy)

The definition of enthalpy change of atomisation :
It is the heat energy change when  one mole of separate gaseous atom of the element is formed from the element under standard state conditions.

By breaking the O2 bond we obtain 2 moles of oxygen atom. But enthalpy change of atomisation requires only one mole of gaseous atom to be formed.

Hence the answer will be :150/2 = 75 KJ/mol

Adzel:
Can someone plz answer these questions for me  :)...

nid404:
All of these? in a few hours.

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