A piston$-$cylinder device initially contains $4\mathrm{.}00$ L of air at $100$ kPa and $25C.$ Air is now compressed to a final state of $600$ kPa and $150C.$ The useful work input is $1\mathrm{.}2$ kJ $.$ Assume the surroundings are at $100$ kPa and $25C.$

$15$

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Problem $09\mathrm{.}042.$a $-$ Exergies of piston air compression

Determine the exergy of the air at the initial and the final states. The gas constant of air is $R=0\mathrm{.}287$kPa$*\frac{m^3}{k}g*K.$ Use the table containing the ideal$-$gas specific heats of various common gases. $($Round the final answer to three decimal places.$)$

The exergy of the air at the initial state is $$ kJ$.$

The exergy of the air at the final state is $$ kJ $.$