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The van der Waal's equation of state for...

The van der Waal's equation of state for some gases can be expressed as :
`(P + (a)/( V^(2))) ( V - b) = RT`
Where `P` is the pressure , `V` is the molar volume , and `T` is the absolute temperature of the given sample of gas and `a, b , and R` are constants.
The dimensions of ` a` are

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Dimensions of `(a)/(V^(2))` will be same as dimensions of pressure
`([a])/([L^(3)]^(2))=ML^(-1)T^(-2)" "[a]=ML^(5)T^(-2)`
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