A high-pressure cell has a volume of 1.0 ft3 and contains a gas of gas gravity GG = 0.65 a t3000 psia and 150 °F. The gas include 2% of H₂S, 3% of N₂ and 4% of CO2. Unknown amount of the gas measured at 14.7 Psia and 60 °F was lost from the cell through a leaky valve, as the pressure and temperature in the cell dropped to 2000 psia and 120 °F. Calculate the gas deviation factor (Z) at the final conditions (2000 Psia at 120 °F)? Calculate the gas compressibility (Cg) at the final conditions. How many SCF of the gas were lost from the tank?