To answer this item, we assume that the air is an ideal gas, such that it behaves following the ideal gas law,
  PV = nRT
If all else are equal in two systems, comparison of the relationship of the volume and pressure becomes,
  PâVâ = PâVâ
Substituting the known values in the equation,
  (203 kPa)(0.5 L) = (50.8 kPa)(Vâ)
The value of Vâ from the equation is 1.998 L or 2 L.Â
Hence, the answer is the third choice, 2.0 L.Â