$4.$ A pipe is coated on the inside with naphthalene and has an inside diameter of $2\mathrm{.}5$ cm anda length of $1\mathrm{.}1$ m$.$ Air at $318$ K and $101\mathrm{.}32$ kPa flows through this pipe at a velocity of $10$m$/$s$.$ Calculate the molar flux of naphthalene $($kmol$/$m$2$s$)$ which evaporates to air and masstransfer coefficients $($kc$,$ ky$)$ at process conditions. Dnapht$-$air$=6\mathrm{.}92\backslash$times $10-6$ m$2/$s; $$air$=1\mathrm{.}932\backslash$times $10-5$Pa$.$s; air$=1\mathrm{.}114$ kg$/$m$3$; Pnapht $=74$ kPa at process conditions.