Question

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Answer 1

                Initial conditions                                      Final conditions

Pressure = P1= 20.0 atm                              Pressure = P2= 3.0 atm

Volume = V1= 1.0L                                       Volume = V2= ?

     according to Boyle's law, at constant pressure

   P1V1=P2V2

20.0 x 1.0 = 3.0 x V2

V2= 6.666L

Final volume of helium gas = V2= 6.67 L