In Real Gas equation, where Pideal=Preal+Pcorrection Pcorrection is intermolecular forces of attraction and if we add it in Preal it will be less then Pideal. So why isn't the equation is Pideal=Preal-Pcorrection where intermolecular forces of attraction is deducted and it then becomes equal to Pideal?

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The relation between pressure exerted byan ideal gas $(p_{i d e a l})$ and observed pressure $(p_{r e a l})$ is given by the equation,

$P_{i d e a l} = P_{r e a l} + \frac{a n^{2}}{V^{2}}$

(i) If pressure is taken in $N m^{- 2}$ , number of moles in mol and volume in $m^{3}$ ,calculate the unit of 'a'.

(ii) What will be unit of 'a' when pressure is in atmosphere and volume in $d m^{3}$ ?

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