$(10$ pts$)$ Suppose you are asked to analyze $317\mathrm{.}00lb$ of gas mixture with the following composition:

$C{O}_{2}65\%,CO8\%,N_{2}27\%$

What is the average molecular weight of the gas in $\frac{g}{m}ol?$

$4.(10$ pts$)$ The following table lists values of $Fe,Cu,$ and $Pb$ in Christmas wrapping paper for two different brands. Convert the ppm to mass fraction on a paper$-$free basis.

$\backslash$table$[[,$Concentration, Ppm$],[,Fe,Cu,Pb$