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What is the compressibility facto (Z) fo...

What is the compressibility facto (Z) for 0.02 mole of a van der Waal's gas at pressure of 0.1 atm. Assume the size of gas molecules is neligible.
Given : RT = 20 L. atm `"mol^(-1)` and `alpha` = 1000 atm `L^(2) "mol^(-2)`

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