Physics

Problem

A closed system undergoes a process in which

\Delta S_{\text{sys}} = -40\,\text{J\,K}^{-1}

and

\Delta S_{\text{surr}} = +40\,\text{J\,K}^{-1}

. Which description of the process is correct? a) It is impossible because

\Delta S_{\text{sys}}

is negative. b) It is irreversible with

\Delta S_{\text{univ}} = +80\,\text{J K}^{-1}

. c) It is reversible. d) It is irreversible since only the surroundings gain entropy.