Answer :
Given
Cross sectional area A =10cm2=10
10-4m2
mass of piston = 1kg
Pressure inside chamber = 100kPa=105Pa
Pressure due to the weight of the piston =Pp
Pressure of vessel P1=pressure of chamber+ pressure due to piston
P1=105+9.8
103
Volume of gas inside the vessel V1=length of gas column
area.
Given length of gas column=20cm=0.2m
V1=length 
A
V1=0.2
10
10-4=2
10-4m3
After evacuation, pressure of chamber will be zero. So, pressure inside vessel after evacuation P2 will just be pressure due to piston.
P2=0+9.8
103
Let L be the final length of the gas column
Final volume V2=AL=10
10-4
L
Since, it is given in question that temperature remains constant, we can apply boyle’s law which states that ‘PV=constant when temperature is constant’.
Applying boyle’s law before and after evacuation,
P1V1=P2V2
(105+9.8
103)
2
10-4=9.8
103
10
10-4
L
The length of the gas column after evacuation =2.2m
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