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QUESTION

# What is the equation of Enthalpy of Atomisation of Copper ?

The standard of atomization, DeltaH_"atom"^@, for atoms is just for the process of converting however many "mol"s of the standard state (i.e. at 25^@ "C" and "1 atm") of the element needed to make "1 mol" of its gaseous form.

Thus the DeltaH_"atom"^@ of "Cl"_2(g) to "Cl"(g) is for this reaction, for instance:

1/2"Cl"_2(g) -> "Cl"(g)

which is really half the enthalpy of breaking the "Cl"-"Cl" bond of "1 mol" of "Cl"_2(g) molecules, at 25^@ "C" and "1 atm".

For "Cu"(s), which is a transition metal, its DeltaH_"atom"^@ is based on the reaction:

"Cu"(s) stackrel(Delta" ")(->) "Cu"(g)

which in this case is really the enthalpy of sublimation for copper solid, at 25^@ "C" and "1 atm".

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