Explain standard enthalpy of atomisation (Delta_(s)H^(@))

1.	Explain standard enthalpy of atomisation (Delta_(s)H^(@))
Answer» Solution :It is defined as the enthalpy change ACCOMPANYING the DISSOCIATION of one mole of the substance completely into its atoms in the gasous state. Example : `H_(2(g)) RARR 2H_((g)) , Delta_(s)H^(@) = 435.4 kJ mol^(-1)`.

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