In a reversible adiabatic process $\Delta S$ is :-

Among the following processes,for which process is the change in entropy $(\Delta S)$ negative?

Which functions are required to understand the second law of thermodynamics?

Calculate the entropy change of the surrounding if $2 \ moles$ of $H_2$ and $1 \ mole$ of $O_2$ gas combine to form $2 \ moles$ of liquid water by releasing $525 \ kJ$ of heat to the surrounding at constant pressure and at $300 \ K$. (in $J \ K^{-1}$)

The enthalpy of vaporization of water is $186.5 \, kJ \, mol^{-1}$. What is the entropy of vaporization in $kJ \, K^{-1} \, mol^{-1}$?

For a spontaneous process,