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The SI unit of the gas constant $R$ is

A $J K^{- 1} mo l^{- 1}$
B $L atm K^{- 1} mo l^{- 1}$
C $cal K^{- 1}$
D $Pa m^{3}$

Answer: A

R = P V / n T

has units of (pressure x volume)/(mol x K)

= Pa m^{3} K^{- 1} mo l^{- 1} = J K^{- 1} mo l^{- 1}

in SI.

L atm

is not SI.

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