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mass transfer It is desired to calculate the rate of diffusion of carbon dioxide in air at steady state through a packed bed of sand

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It is desired to calculate the rate of diffusion of carbon dioxide in air at steady state through a packed bed of sand at 350K and a total pressure of 1atm. The bed depth is 2m and the void fraction is 0.4. The partial pressure of carbon dioxide at the top of the sand is 3105Pa and 0.02Pa at the bottom. Use tortuosity of 2

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