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2. Pressurized hydrogen gas is stored at 358 K in a 4.8 m outer diameter spherical container make of nickel. The shell of the container is 6 cm thick. The molar concentration of hydrogen in the nickel at the inner surface is determined to be 0.087 kmol/m. The concentration of hydrogen in the nickel at the outer surface is negligible. Find the concentration profile of hydrogen and determine the mass flux of hydrogen by diffusion at a distance of 2.37 m from the center of the nickel container. Given that DH2-Ni = 1.2 x 10-12 m/s and molecular weight of H2 is 2 kg/kmol