Nitrogen gas at high pressure and 298 K is contained in a 2-m × 2-m × 2-m cubical container made of natural rubber whose walls are 3 cm thick. The concentration of nitrogen in the rubber at the inner and outer surfaces are 0.067 kg/m3 and 0.009 kg/m3, respectively. The diffusion coefficient of nitrogen through rubber is 1.5×10-10 m2/s. The mass flow rate of nitrogen by diffusion through the cubical container is
(a) 8.1×10-10 kg/s
(b) 3.2×10-10 kg/s
(c) 3.8×10-9 kg/s
(d) 7.0×10-9 kg/s
(e) 1.60×10-8 kg/s
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