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The units of constants a in van der Waal...

The units of constants a in van der Waals' equations is

A

`dm^6 atm "mol"^(-2)`

B

`dm^3 atm "mol"^(-1)`

C

`dm atm "mol"^(-1)`

D

` atm "mol"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`(n^2a)/(V^2) `is the pressure correction in Van der Waals equation. So its unit must be same as that of pressure.
Unit of `(n^2 .a)/(V^2) ` = unit of pressure
`("mole")^2 xxa)/((dm^3)^2) = atm`
`a = dm^6 .atm. "mol"^(-2)`
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