Saturated water vapor at 25°C (Psat = 3.17 kPa) flows in a pipe that passes through air at 25°C 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 × 10–6kg
(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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