The answer for the following problem is mentioned below.
- <u><em>Therefore the final volume of the gas is 100 ml.</em></u>
Explanation:
  Given:
Initial pressure ( ) = 600 mm of Hg
) = 600 mm of Hg
Final pressure ( ) = 1200 mm of Hg
) = 1200 mm of Hg
Initial volume ( ) = 200 ml
) = 200 ml      
To find:
 Final volume ( )
)
We know;
According to the ideal gas equation,
      P × V = n × R × T
Where;
P represents the pressure of the gas
V represents the volume of the gas
n represents the no of moles of the gas
R represents the universal gas constant
T represents the temperature of the gas
So,
  From the above mentioned equation,
         P × V = constant
 =
 = 
Where,
( ) represents the initial pressure of the gas
) represents the initial pressure of the gas
( ) represents the final pressure of the gas
) represents the final pressure of the gas
( )  represents the initial volume of the gas
)  represents the initial volume of the gas
( )  represents the final volume of the gas
)  represents the final volume of the gas
So;
 =
 =  
    
 = 100 ml
 = 100 ml 
<u><em>Therefore the final volume of the gas is 100 ml.</em></u>