Help, solve with the data given by the problem and with mass transfer calculations, please.

*Determination of the relative humidity of an air current. A stream of Air passes through a duct containing a wet-bulb thermometer and a dry-bulb thermometer. The readings on these thermometers are 17 and 37 C, respectively. Determine the humidity relative to the airflow.

* Determination of the rate of evaporation of water. A stream of air flows at a speed of 1.20 m/s, has a temperature of 25 C and a relative humidity of 30%. This Current flows parallel to a surface of water at 15 C for a path of 20 cm. Calculate the rate of evaporation of water.