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1. Consider the diffusion of hydrogen in air at 293 K Calculate the species flux on both molar and mass bases if the concentration gradient at a particular location is dc / dz=1 kmol/m m. The mole fraction of the hydrogen, xa, is much less than unity Given: For Hz/air at 298 K, DAB=0.41x104m2/s Answer: - 4 x 10-5 kmol ; -8 x 10-5 kg m?s ms