Evaporation rate. A porous wick is soaked with ethanol and air flows on top of the wick.

The temperature and pressure of air is $20C$ and $1$atm respectively. At a fixed $x$ position

$(x_0),$ the molar concentration of ethanol in the air, $C_A,$ was measured as a function of the

distance $z$ from the wick. See the figure below.

$C_A=4e^{-1\mathrm{.}5z}$ describes the vertical ethanol distribution at $x_0.$ The units of $C_A$ is kmo$\frac{l}{m^3}.$

Calculate the molar flux of ethanol from the wick at $x_0^{1}1)$ Evaporation rate. A porous wick is soaked with ethanol and air flows on top of the wick. The temperature and pressure of air is $20\backslash$deg C and $1$ atm respectively. At a fixed x position $($x$0),$ the molar concentration of ethanol in the air, CA$,$ was measured as a function of the distance z from the wick. See the figure below.