Pressurized hydrogen gas is stored at 358 K in 4.8 m outer diameter spherical container made of nickel. The shell of the container is 6 cm thick. The molar concentration of hydrogen in the nickel is determined to be 0.087 kmol/m. The concentration of hydrogen in nickel at the outer surface is negligible. Note: The diffusion coefficient of hydrogen in nickel at 358 K is 1.2 x 102 m/s. Assume one directional, steady state, unimolecular diffusion and dilute system. (a) Obtain the concentration profile for the hydrogen in nickel across the thickness of the container i.e. CA f(r) where A is hydrogen and r is the radial coordinate. %3D (b) Determine the mass flow rate of hydrogen by diffusion through the nickel container O 1.3e-6 O 23e-4 O 13e-10 O 23e-10

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