Question

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

• A. atm litre $mo{l}^{-1}$
• B. atm $d{m}^{3}mo{l}^{-1}$
• C. dyne $cmmo{l}^{-1}$
• D. All of these

Answer 1

Answer: (D)

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

$=$ atm $d{m}^{6}mo{l}^{-2}=dync{m}^{4}mo{l}^{-2}$

Unit of $b=Lmo{l}^{-1}=d{m}^{3}mo{l}^{-1}=c{m}^{3}mo{l}^{-1}.$