Chapter 10, Problem 73RQ

To three significant figures, calculate the density in g L^-1 of the following gases at $\text{STP: }\left(\text{a}\right){\text{ C2H}}_{\text{6}}\left(\text{ethane}\right)\text{, }\left(\text{b}\right){\text{ N}}_{\text{2}}\text{, }\left(\text{c}\right){\text{ Cl}}_{\text{2}}\text{, }\left(\text{d}\right)\text{ Ar}\text{.}$