Explain standard enthalpy of subslimation `[Delta_("sub")H^(@))`.

Explanation

It is defined to the change in enthalpy when one mole of a solid substance sublimes at a constant temperature and standard pressure (1 bar)
Example : `CO_(2(g)) rarr CO_(2(g)) , Delta_("sub")H^(@) = 25.2 kJ mol^(-1)`.