$(20$ pts$.)$ Evaluate the Prandtl number $($Pr$),$ Schmidt number $($Sc$),$ and Lewis number $($Le$)$ for air at the following conditions:

a$.P=1$atm,$T=298K.$

b$.P=1$atm,$T=2000K.$

c$.P=10$atm,$T=298K.$

Assume a binary diffusion coefficient $D=2\mathrm{.}1**{10}^{-5}\frac{m^2}{s}$ at $1$ atm and $298$ K $.$