A Carnot Engine operates according to the following:

The engine is a closed system, containing $1$ kg of air

A hot reservoir is available at $800$ K

Heat transfer from the hot reservoir to air equals $30$ kJ $.$

Maximum and minimum pressures for this engine are $5000$kPa$(a)$ and $150$kPa$(a)$

For air: $R=0\mathrm{.}287k\frac{J}{k}g*K,y=1\mathrm{.}4,MW=29k\frac{g}{k}$mol