The [[Gas|gas]] constant of a substance is related to the [[Universal Gas Constant|universal gas constant]] and the [[Molar Mass|molar mass]] of the [[Substance|substance]].
$R=\dfrac{\bar{R}}{M}$
To calculate the gas constant of a mixture the following relation can be used:
$R_{tot}=\sum_{i=1}^kc_iR_i$