Ncert Exercises & Solutions

Represent the potential energy/enthalpy change in the following processes graphically.

1. Throwing a stone from the ground to roof.

2. $\frac{1}{2} H_{2} (g) + \frac{1}{2} {Cl}_{2} (g) ⇌ HCl (g); ∆_{r} H^{⊝} = - 92.32 kJ {mol}^{- 1}$

In which of the processes potential energy/enthalpy change is contributing factor to the spontaneity?

Representation of potential energy/enthalpy change in the following processes

(a) Throwing a stone from the ground to roof.

(b)

\frac{1}{2} H_{2} (g) + \frac{1}{2} {Cl}_{2} (g) ⇌ HCl (g); ∆_{r} H^{⊝} = - 93.32 kJ {mol}^{- 1}

Energy increases in (a) and it decreases in (b) process. Hence, in process (b), enthalpy change is the contributing factor to the spontaneity.