A patient's oxygen tank holds 21.9 L of oxygen (O2) at a pressure of 24.3 atm. What is the final volume, in liters, of this gas when it is released at a pressure of 2.50 atm with no change in temperature and amount of gas?

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the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.