$11-2.$ Estimate the emission rates, expressed as $\frac{g}{m^2}*d,$ for carbon dioxide and meth from the surface of a landfill duc to diffusion alone. Assume the following col tions apply:

$($a$)$ Temperature $=30C$

$($b$)$ Landfill cover material $=$ clay$-$loam mixture

$($c$)$ Porosity of landfill cover material $=0\mathrm{.}23$

$($d$)$ Landfill cover thickness $=2ft$

$($e$)$ Coefficient of diffusion for methane $=0\mathrm{.}20c\frac{m^2}{s}(18\mathrm{.}6f\frac{t^2}{d})$

$($f$)$ Coefficient of diffusion for carbon dioxide $=0\mathrm{.}13c\frac{m^2}{s}(12\mathrm{.}1f\frac{t^2}{d})$

$($g$)$ Note that $(\frac{g}{c}{m}^2*s)0\mathrm{.}864{10}^9=\frac{g}{m^2}*d$

Please help with all parts If excel is used please include formulas