This can simply be done using Boyles law which states that at constant temperature Pressure is inversely proportional to Volume i.e. compairing two pressures and volumes
P1V1=P2V2
here P1=63 atm
V1=338 L
P2= 1atm (standard pressure)
Therefore V2=(63 atm * 338 L)/1atm
=21,294 L
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