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The compressibility factor for definite ...

The compressibility factor for definite amount of van der Waals' gas at 0°C and 100 a tm is found to be 0.5. Assuming the volume of gas molecules negligible, the van der Waals' constant a for a gas is

A

`(1.256 L^2 mol^-2 atm)`

B

`(0.256 L^2 mol^-2 atm)`

C

`(2.256 L^2 mol^-2 atm)`

D

`(0.0256 L^2 mol^(-2) atm)`

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The correct Answer is:
A
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