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The units of van der Waals' constants a ...

The units of van der Waals' constants a and b respectively are

A

`L " atm"^(2) " mol"^(-1) and "mol L"^(-1)`

B

L atm `mol^(2)` and mol L

C

`L^(2)` atm `"mol"^(-2)` and `"mol"^(1) L `

D

`L^(-2) " atm"^(-1) "mol"^(-1) and L " mol"^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
C
a and b are expressed in terms of the units of P and V.
Pressure correction `= P.=(n^(2)a)/( V^(2))`
`a=(P.V^(2))/(n^(2))=("pressure" xx "(volume)"^(2))/("(mole)"^(2))`
Unit of `a = atm xx (L)^(2) "mol"^(-2)`
Unit of b is the same as for the volume. i.e., L `"mol"^(-1)`
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