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  4. The SI unit of universal gas constant (R) is

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Q. The $SI$ unit of universal gas constant $(R)$ is

Physical World, Units and Measurements

Solution:

$PV=nRT$
$ \Rightarrow R=\frac{PV}{nT}$
$=\frac{joule}{mole\times kelvin}$
$=J\,K^{-1}\,mol^{-1}$