Saturated water vapor at 25ºC (Psat = 3.17 kPa) flows in a pipe that passes through air at 25ºC with a relative humidity of 40 percent. The vapor is vented to the atmosphere through a 9-mm-internal diameter tube that extends 10 m into the air. The diffusion coefficient of vapor through air is 2.5×10-5 m2/s. The amount of water vapor lost to the atmosphere through this individual tube by diffusion is
(a) 1.7×10-6 kg
(b) 2.3×10-6 kg
(c) 3.8×10-6 kg
(d) 5.0×10-6 kg
(e) 7.1×10-6 kg
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