For a process,entropy change of a system is expressed as

The molar heat of vaporisation of a liquid is $6 \ kJ \ mol^{-1}$. If the entropy change is $16 \ J \ mol^{-1} \ K^{-1}$,the boiling point of the liquid is:

In which of the following reactions is $\Delta S$ maximum?

The second law of thermodynamics states that in a cyclic process:

In an isolated system,find the condition for a spontaneous reaction.

One mole of $NaCl$ $(s)$ on melting absorbed $30.5 \ kJ$ of heat and its entropy increased by $28.8 \ J \ K^{-1}$. The melting point of $NaCl$ is ............. $K$.