Saturated water vapor at 25°C (P_sat = 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 7-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) 1.02 × 10^-6 kg

(b) 1.37 × 10^-6 kg

(c) 2.28 × 10^-6 kg

(d) 4.13 × 10^-6 kg

(e) 6.07 × 10^-6 kg