Question

Represent the potential energy / enthalpy change in the following processes graphically:
(a) Throwing a stone from the ground to roof.
(b) $\frac{1}{2}H_{2}(g)+\frac{1}{2}Cl_{2}(g)\rightleftharpoons HCl(g), \triangle_r H^\ominus = 92.32kJ mol^{-1}$
In which of the processes potential energy / enthalpy change is contributing factor to the spontaneity?

Answer 1

"Enthalpy of atomization:

It is the "enthalpy change" when "1 mole" of a substance completely dissociates into gaseous atoms. This value is always positive because during separation of bonds with heat energy all the bond separates and no bond unites. The value does not remain constant as they change with the breakage of bonds.

Both (a) and (b) are indicates enthalpy change."