Mass = 0.12kg
Initial temp = 500°c = 773K
Initial pressure = 0.8 MPa = 800,000 Pa
Final volume = 90L
R = 287 Jkg^-1K^-1
1) Initial Volume
V=mRT/P
0.12 x 287 x 773 / 800,000 = 26,662.12m^3
2) Final Pressure
P2 = P1P2^1.2/V2^1.2
800,000 x 26,662.12^1.2 / 90 = 1,816,095,330 Pa = 1,816 MPa
3)...