We assume that the gas given above behaves as an ideal gas. For ideal gases, we can make use of Boyle's law which states that,
P1V1 = P2V2
where P and V are pressure and volume, respectively. Substituting the known values,
(103 kPa) x (7 L) = (219 kPa) x (V2)
The value of V2 is approximately 3.29 L.
