The unit of the Van der Waals constant 'a' is | vedclass

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(A) The Van der Waals equation for real gases is given by: $(P + \frac{an^2}{V^2})(V - nb) = nRT$. From the term $\frac{an^2}{V^2}$,which is added to

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$atm\,L^2\,mol^{-2}$

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(A) The Van der Waals equation for real gases is given by: $(P + \frac{an^2}{V^2})(V - nb) = nRT$. From the term $\frac{an^2}{V^2}$,which is added to pressure $(P)$,the units of $\frac{an^2}{V^2}$ must be the same as the units of pressure $(atm)$. Therefore,$unit(a) = unit(P) 	imes \frac{unit(V)^2}{unit(n)^2}$. Substituting the units: $unit(a) = atm 	imes \frac{L^2}{mol^2} = atm\,L^2\,mol^{-2}$.

The unit of the Van der Waals constant '$a$' is .......

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