A liquid $$A$$ is evaporating into a pure carrier gas $$B$,$ which is flowing with a

certain velocity across a flat surface of pure A$.$ The evaporation of A is driven by this wind and occurs at room temperature.

$($a$)$ Sketch the concentration $($x$-$axis$)$ profile of A as a function of height, z $($y$-$axis$)$ based on a laminar boundary layer. Make sure the curvature is correct. Include points $$s$($surface$),$infinity$($far$),$ and z $=0$ at the surface.

$($b$)$ Assign values to the boundary conditions, given that $$A$$ is toluene and $$B$$ is air. What sources did you use to make your calculations?