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  4. The ratio a / b (the terms used in van der Waals' equation) has the unit

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Q. The ratio $a / b$ (the terms used in van der Waals' equation) has the unit

States of Matter

Solution:

Unit of $a=$ atm $L^{2} m o l^{-2}$

$\quad= $ atm $dm ^{6} mol ^{-2}= dyn \,cm ^{4} mol ^{-2}$

Unit of $b= L \,mol ^{-1}=d m^{3} mol ^{-1}= cm ^{3} mol ^{-1} .$