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 × 104 nr/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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