The van der Waals' constant 'b' of a gas...

The van der Waals' constant 'b' of a gas is `4pixx 10^(-4)L//mol.` How near can the centers of the two molecules approach each other? [Use :`N_(A)=6xx10^(23)`]

`10^(-7)m`

`10^(-10)m`

`5xx10^(-11)m`

`5xx10^(-9)m`

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