Chemical Thermodynamics — Chemistry STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryChemical Thermodynamics2 Marks
Question
What is relation between spontaneity and energy of a system ?
✓
Answer
(1) The spontaneous process takes place in a direction in which energy of the system decreases. For example, neutralisation reaction between $NaOH$ and $HCl$ solution is exothermic with release of energy.
(2) The spontaneous process also takes place with the increase in energy by absorbing heat. For example, (a) Melting of ice at $0^{\circ} C$ by absorption of heat (b) Dissolution of $NaCl$, $\begin{aligned} & NaCl _{( s )}+ aq \rightarrow NaCl _{( aq )} \rightarrow Na ^{+}{ }_{( aq )}+ Cl _{( aq )}^{-} \\ & \Delta H ^0=+3.9 kJ mol ^{-1} \end{aligned}$
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