4. Oxygen gas inside 1.5 L gas tank has a pressure of 0.95 atm. Provided that the temperature remains constant, how much pressure is needed to reduce its volume by 2?
Initial pressure given in the question is 0.95 atm. The initial volume is 1.5 l and the final volume is 1/2 of its value, thus 0.75l. Thus, new pressure will be 1.9 atm.
