The equation of state for a gas is given by PV=nRT+αV, where n is the number of moles and α is a positive constant. The initial temperature and pressure of one mole of the gas contained in a cylinder are To and Po respectively. The work done by the gas when its temperature doubles isobarically will be
PoToRPo−α
PoToRPo+α
PoToR
PoToRln2
A
PoToRln2
B
PoToR
C
PoToRPo−α
D
PoToRPo+α
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Solution
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Isobaric process means pressure will be constant. For one mole gas, n=1 If Vi is the initial volume, P0Vi=RT+αVi,Vi=RT0P0−α If Vf is the final volume, P0Vf=R.2T0+αVf,Vf=2RT0P0−α The work done =∫VfViP0dV=P0[Vf−Vi]=P0RT0P0−α
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