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Thermodynamics — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryThermodynamics5 Marks
Question
Represent the potential energy/enthalpy change in the following processes graphically.
  1.  Throwing a stone from the ground to roof.
  2.  $\frac{1}{2}\text{H}_2(\text{g})+\frac{1}{2}\text{Cl}_2(\text{g})\rightleftharpoons\text{HCl}(\text{g})$ $\Delta_\text{r}\text{H}^\ominus=-92.32\text{kJ}\ \text{mol}^{-1}$​​​​​​
In which of the processes potential energy/enthalpy change is contributing factor to the spontaneity?
✓

Answer

  1. On throwing stone from ground to the roof we need to suply energy to the stone Graphically, it can be represented as:
  2. In the reaction heat is evvolved it means the process is followed by decrease in energy. It can be represented as


Energy increase in (a) part and decrease in (b). Hence, in process (b), the enthalpy change is the contributing factor to the spontaneity.

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