Oxygen gas is commonly sold in 48.0L steel containers at a pressure of 130atm .What volume (in liters) would the gas occupy if its temperature was raised from 20.5∘C to 40.0∘C at constant 130atm ?

Answer 1

If it's still in that 48.0 L container the volume will be, guess what, 48.0L. I assume you are asking what volume if the gas were allowed to expand freely but the question isn't clear on that.
(V1/T1) = (V2/T2)
Remember T must be in kelvin.