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When unit of pressure is atm and that of...

When unit of pressure is atm and that of volume is `dm^(3)` then unit of R is `"_____________"`.

A

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

B

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

C

`atm K^(-1) mol^(-1)`

D

`atm dm^3 K^(-1)`

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