Question

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

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

Solution

## The correct option is A 1+PbRTThe van der Waals' equation is given as  (P+aV2)(V−b)=RT  (for 1 mol of gas) At high pressure, aV2 term  can be neglected, since P is large. PV−Pb=RT  or   PV=RT+Pb PVRT=1+PbRT Z=1+PbRTChemistry

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