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Calculate the volume (in litre) occupied by 4 mole of a van der Waal's gas present at a temperature of `400 K` and exerting a pressure of `2` atm if van der Waal's constant `a and b` are respectively `33.256 Pa-m^(6)//mol^(2) and 10^(-2) m^(3)//"mole". ["Given" : R = 0.0821 "atm-lit/mol K" or 8.314 Pa-m^(3)//"mol K"]`

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