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A large sheet of material 40mm thick contains dissolved hydrogen (H2) having a uniform concentration of 3kmol/m3. The sheet is exposed to a fluid stream

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A large sheet of material 40mm thick contains dissolved hydrogen (H2) having a uniform concentration of 3kmol/m3. The sheet is exposed to a fluid stream that causes the concentration of the dissolved hydrogen to be reduced suddenly to zero at both surfaces. This surface condition is maintained constant thereafter. If the mass diffusivity of hydrogen is 9107m2/s, how much time is required to bring the density of dissolved hydrogen to a value of 1.2kg/m3 at the center of the sheet

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