A desiccant is being used to remove water vapor from a stream of air a $50C.$ The desiccant is a

flat plate with $25cm$ length and $10cm$ width. The stream of air has velocity of $5\frac{m}{s}$ moving over

the surface in the direction of the $25cm$ length. The mass diffusivity of water vapor in air is

$0\mathrm{.}18{10}^{-4}\frac{m^2}{s}.$ Determine the mass transfer coefficient of water vapor from the air to the

desiccant surface.