From the Charle's law the volume of a fixed mass of a gas is directly proportional to absolute temperature at constant pressure. Therefore, V/T is a constant, and hence, for two gases V1/T1 =V2/T2
hence; temperature changes from (273+27) K to (273+127) K
9/ 300 = V2/400
V2= 12 L
Therefore, the final volume is 12 liters .
