The standard heat of sublimation of sodium metal is 108.4`kJ*mol^(-1)`. What is its standard heat of atomisation?

Explanation

At `25^(@)C`, the standard state state of sodium is Na(s). The sublimation process of Na(s) is : Na(s)`to`Na(g). At `25^(@)C` the enthalpy change in this process is equal to the sublimation enthalpy of Na-metal. Again, in the above process, 1 mol of Na(g) is formed from Na(s). So, at `25^(@)C`, the enthalpy change in this process is equal to the standard enthalpy of atomisation of sodium. thus, the standard enthalpy of atomisation of sodium is 108.4 kJ`*mol^(-1)`.