Q$12$: Air is compressed in a piston$$cylinder device from $90$ kPa and $20$C to $750$ kPa in a reversible isothermal process. Determine the entropy change of air. The gas constant of air is R $=0\mathrm{.}287$ kJ$/$kg$$K$.($Round the final answer to four decimal places.$)$ The entropy change of air is $-0\mathrm{.}6027$ Numeric ResponseEdit Unavailable. $-0\mathrm{.}6027$ incorrect.kJ$/$kg$$K$.$