Two identical containers A and B have frictionless pistons. They contain the same volume of an ideal gas at the same temperature. The mass of the gas in A is mA and that in B is mB. The gas in each cylinder is now allowed to expand isothermally to double the initial volume. The change in the pressure in A and B, respectively, is ∆p and 1.5 ∆p. Then
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a
4mA=9mB
b
2mA=3mB
c
3mA=2mB
d
9mA=4mB
answer is C.
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Detailed Solution
For the gas in container AΔP=PAfinal −PAintial =nART2V−nARTVΔP=−nART2V ........(i)For gas in container B1.5ΔP=PBfinal −PBintial =nBRT2V−nBRTV1.5ΔP=−nBRT2V ............(ii)From Eqs. (i) and (ii), we get nB=1.5nA⇒ 2nB=3nA or 2mB=3mA