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For a real gas (mol. Mass= 30 ) if densi...

For a real gas (mol. Mass= 30 ) if density at critical point is`0.40 g//cm^(3)` and its `T_(c ) = ( 2 xx 10^(5))/( 821) `K, then calculate Vander Waal's constant a( in atm `L^(2) mol^(-2))`.

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