The legal limit for human exposure to CO in the work place is 35ppm.Assuming that the density of air is $1.3g/L$,how many grams of CO are in 1.0L of air at the maximum allowable concentration?

Question

$\begin{array}{1 1}4.55\times 10^{-5}g\;CO\\3.55\times 10^{-5}g\;CO\\2.55\times 10^{-5}g\;CO\\1.55\times 10^{-5}g\;CO\end{array} $