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 4 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) 8.24 × 10^-10 kg/s

(b) 1.35 × 10^-10 kg/s

(c) 5.22 × 10^-9 kg/s

(d) 9.71 × 10^-9 kg/s

(e) 3.58 × 10^-8 kg/s