In a laboratory experiment, air at \(300 \mathrm{~K}\) and 1 atm is blown at high speed parallel to the surface of a rectangular shallow pan that contains liquid acetone \(\left(\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}\right)\), which evaporates partially. The pan is \(1 \mathrm{~m}\) long and \(50 \mathrm{~cm}\) wide. It is connected to a reservoir containing liquid acetone which automatically replaces the acetone evaporated, maintaining a constant liquid level in the pan. During an experimental run, it was observed that \(2.0 \mathrm{~L}\) of acetone evaporated in \(5 \mathrm{~min}\). Estimate the mass-transfer coefficient. The density of liquid acetone at \(300 \mathrm{~K}\) is \(0.79 \mathrm{~g} / \mathrm{cm}^{3}\); its vapor pressure is \(27 \mathrm{kPa}\) (Perry and Chilton, 1973).