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Question

The compressiblity factor for a real gas at high pressure is:

A
1+RTPb
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B
1
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C
1+PbRT
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D
1PbRT
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Solution

The correct option is C 1+PbRT
The van der Waals' equation is given as
(P+aV2)(Vb)=RT (for 1 mol of gas)

At high pressure, aV2 term can be neglected, since P is large.

PVPb=RT
or PV=RT+Pb

PVRT=1+PbRT

Z=1+PbRT

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