Question $14$

$3/8$ pts

A system contains $1$ kg of air modeled as an ideal gas with a constant specific heat ratio, $k=1\mathrm{.}379.$ The air undergoes a constant$-$temperature expansion at $450$ K from $P_1=1\mathrm{.}9$MPa to $P_2=0\mathrm{.}4$MPa. This can be modeled as a polytropic process with $n=1.$ Determine the work done, in kJ$.$ Note: only input the numerical value without units. Also, remember to put a negative sign if the work is negative.