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# 3325.6 - Solution This problem calls for the mass of...

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5.6 The purification of hydrogen gas by diffusion through a palladium sheet was discussed in Section 5.3. Compute the number of kilograms of hydrogen that pass per hour through a 5-mm-thick sheet of palladium having an area of 0.20 m 2 at 500 ° C. Assume a diffusion coefficient of 1.0 10 -8 m 2 /s, that the concentrations at the high- and low-pressure sides of the plate are 2.4 and 0.6 kg of hydrogen per cubic meter of palladium, and that steady-state conditions have been attained.
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Unformatted text preview: Solution This problem calls for the mass of hydrogen, per hour, that diffuses through a Pd sheet. It first becomes necessary to employ both Equations 5.1a and 5.3. Combining these expressions and solving for the mass yields M = JAt = ! DAt 2200 C 2200 x = ! (1.0 2200 10-8 m2/s)(0.20 m2) (3600 s/h) 0.6 ! 2.4 kg /m3 5 2200 10 ! 3 m # 5 % & 220d ( = 2.6 ⋅ 10-3 kg/h...
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