A natural gas (methane, CH4) storage facility uses 3 cm diameter by 6 m long vent tubes on its storage tanks to keep the pressure in these tanks at atmospheric value. If the diffusion coefficient for methane in air is 0.2×10-4 m2/s and the temperature of the tank and environment is 300 K, the rate at which natural gas is lost from a tank through one vent tube is
(a) 13×10-5 kg/day
(b) 3.2×10-5 kg/day
(c) 8.7×10-5 kg/day
(d) 5.3×10-5 kg/day (e) 0.12×10-5 kg/day
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