Find the pressure at 33 KM in standard atmospheric condition?

can i know for subpart c, why the value of the pressure inside is 150101.3 kPa? as the question is finding for the net force in the hatch door and the air inside acting on the hatch door is only 101.3 kPa?

If the PO2 is 100 mm Hg at one barometric pressure (760 mm Hg), what is the approximate PO2 if the pressure is increased to 1,520 mm Hg in a hyperbaric chamber?

(6) 41.3g of water is contained in an 80 liter container. When the temperature is 150 ℃, find the pressure (MPa). Show P-v diagram or T-v diagram and indicate the corresponding state