Explanation
Molecules of a gas move with different speeds.
R = 0.0.082 litre atm K-1 mole-1
The pressure is sum of partial pressures irrespective of the number of their moles.
Charles’ law deals with variation of volume with temperature at constantpressure.
Pressure is doubled, volume is halved (at const. temp.)
After mixing, volume is doubled, so pressures are halved. Hence total pressure after mixing = 50 + 200 = 250 mm.
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