A piston$-$cylinder device contains air which is initially at $310$ K and $80$ kPa $.$ It undergoes two

processes. The first process is isothermal and the second is adiabatic. The final temperature

is $1,300K$ and the final pressure is $240$ MPa $.$ The total work transfer is $-900k\frac{J}{k}g.$ Calculate

the total heat transfer $($in $k\frac{J}{k}g)$ and the pressure at which the isothermal process ends and

the adiabatic process begins. The ideal gas constant for air is $0\mathrm{.}287k\frac{J}{kg*K}.$