Benzene-free air at 25°C and 101.3 kPa enters a 5-cm-diameter tube at an average velocity of 5 m/s. The inner surface of the 6-m-long tube is coated with a thin film of pure benzene at 25 °C. The vapor pressure of benzene (C6H6) at 25°C is 13 kPa, and the solubility of air in benezene is assumed to be negligible. Calculate (a) the average mass transfer coefficient in m/s, (b) the molar concentration of benzene in the out- let air, and (c) the evaporation rate of benzene in kg/h.
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