Hydrogen is stored in a steel rectangular container having a steel wall thickness of 25 mm. The molar concentration of hydrogen at the inside and outside surface of the steel container are 5.5 mol/m^3 and 2.7 mol/m^3. Determine the molar diffusion flux for hydrogen through the container, if the diffusivity of hydrogen in steel is 0.2610 m^2/s. A 2.910^-1 mol/s.m B 2.4x10^-1 mol/s.m C 3.2x10^-1 mol/s.m D 4.2x10^-1 mol/s.m

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