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The compression factor (compressibility factor) for `1 mol` of a van der Waals gas at `0^(@)C` and `100 atm` pressure is found to be `0.5`. Assuming that the volume of a gas molecule is neligible, calculate the van der Waals constant `a`.

A

2524

B

`1.253xx10^-6`

C

1253

D

`2.524xx10^-6`

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