List of top Chemistry Questions on Entropy and free energy

The enthalpy of vapourisation of diethyl ether is $26.0\text{ kJ mol}^{-1}$ and its normal boiling point is $35^\circ C$. What is the value of $\Delta S^0$ for the conversion of liquid diethyl ether to vapour at $35^\circ C$?

The molar entropy of which of the following reaction is negative?

એક આદર્શ ગેસના બે મોલ 300 K પર 10 L થી 100 L સુધી ફ્રી વિસ્તારણ (free expansion) કરે છે. \(\Delta S_{system}\) અને \(\Delta S_{surroundings}\) ના મૂલ્યો છે:

एक आदर्श गैस के दो मोल \(300K\) पर \(10L\) से \(100L\) तक मुक्त प्रसार (free expansion) करते हैं। \(\Delta S_{system}\) और \(\Delta S_{surroundings}\) का मान है :

A protein undergoes reversible thermal denaturation from its initial state N to denatured state D according to \(N \rightleftharpoons D\). At \(60^\circ C\), the concentrations of both N and D are equal at equilibrium, and the standard enthalpy change of denaturation is \(666\ kJ\ mol^{-1}\). The standard entropy change \((\Delta S^\circ)\) in \(kJ\ K^{-1}\ mol^{-1}\) of the protein upon denaturation at \(60^\circ C\) is closest to

Two moles of an ideal gas undergo free expansion from \( 10\text{ L} \) to \( 100\text{ L} \) at \( 300\text{ K} \). The values of \( \Delta S_{\text{system}} \) and \( \Delta S_{\text{surroundings}} \) are (\(R\) is universal gas constant)

At a certain temperature \(K\), during a process, \(500\ J\) is absorbed by the system and work of \(200\ J\) is done by the system. Then change in internal energy of the system is:

In which of the following processes entropy increases?
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from 130 K to 0 K.
C. 2NaHCO₃(s) → Na₂CO₃(s)+CO₂(g)+H₂O(g)
D. Cl₂(g) → 2Cl(g)
Choose the correct answer from the options given below: