Question 18
The entropy change of the surroundings, $\Delta S_{surr}$, is related to heat transfer, $q$, with respect to the system and temperature $T$ by
$\circ$ -q/T$_{surr}$ = $\Delta S_{surr}$.
$\circ$ +q/T$_{sys}$ = $\Delta S_{surr}$.
$\circ$ None of these, unless the system undergoes a reversible process.
$\circ$ -q/T$_{sys}$ = $\Delta S_{surr}$
$\circ$ q/T$_{surr}$ = $\Delta S_{surr}$.