A9.0l volume of chlorine gas is heated from 27c to 127c at a constant pressure. what is the final volume

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 .

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