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Question

The compressibility of a gas is less than unity at STP. Therefore:
  1. Vm>22.4 L
  2. Vm<22.4 L
  3. Vm=22.4 L
  4. Vm=44.8 L


Solution

The correct option is B Vm<22.4 L
Since, compressibility (Z)=PVnRT for Z less than unity
PVnRT<1, or PV<nRT
At STP, 
P=1 atm, T=273K, R=0.0821 L atm K1
i.e V<1×0.0821×273
V<22.4 L

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