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Q.

The critical pressure PC and critical temperature TC for a gas obeying van der Waal's equation are 80 atm and 87∘C. Molar mass of the gas is 130 g/mole. The compressibility factor for the above gas will be smaller than unity under the following condition :

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a

1 atm and 1000∘C

b

1atm and 800∘C

 

c

1 atm and 1100∘C

d

1 atm and 1200∘C

answer is A.

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Detailed Solution

Critical temperature is given sa;

TC=87∘CTB=278×360=1215K or 942∘C

Hence, Z<1 at  T<942∘C.

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