A gas having a molecular mass of  $84.5gmo{l}^{-1}$ enclosed in a flask at  ${27}^{0}C$ has a pressure of 1.5atm. Calculate the density of the gas in g/L

Here, 
$\begin{array}{l}P=1.5atm,T=300K,M=84.5gmo{l}^{-1}\\ R=0.0821Latm{K}^{-1}mo{l}^{-1}\end{array}$
The relationship between pressure and density is 
$\begin{array}{l}P=\frac{\rho RT}{M}\\ \rho =\frac{PM}{RT}=\frac{1.5\times 84.5}{0.0821\times 300}=5.416g{L}^{-1}\end{array}$