On a summer day the air temperature is \(30^{\circ} \mathrm{C}\) and the relative humidity is \(55 \%\). Water evaporates from the surface of a lake at a rate of \(0.08 \mathrm{~kg} / \mathrm{h}\) per square meter of water surface area. The temperature of the water is also \(30^{\circ} \mathrm{C}\). Determine the value of the convection mass transfer coefficient.