Problem IIThere is a piece of 10 mm thick a-iron plate. This plate initiallyhas hydrogen uniformly distributed inside with an initialconcentration Co. Assume that there is no hydrogen in the air. Theplate is left in the air and the hydrogen concentration varies withthe time as follows:4CoC(x, t) =(-9n²Dt\123nxsinеxpwhere / is the thickness of the plate. If we would like to remove95% of the hydrogen from the plate, how long will it take when theplate is at 25 °C?The pre-exponential and activation energy for hydrogen in a-ironare 0.1 mm/s and 13,400 J/mol, respectively.

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There is a piece of 10 mm thick a-iron plate. This plate initially has hydrogen uniformly distributed inside with an initial concentration Co. Assume that there is no hydrogen in the air. The plate is left in the air and the hydrogen concentration varies with the time as follows: (-9n² Dt' exp 4Co 3nx C(x, t) = sin %3D where I is the thickness of the plate. If we would like to remove 95% of the hydrogen from the plate, how long will it take when the plate is at 25 °C? The pre-exponential and activation energy for hydrogen in a-iron are 0.1 mm²/s and 13,400 J/mol, respectively.

There is a piece of 10 mm thick a-iron plate. This plate initially has hydrogen uniformly distributed inside with an initial concentration Co. Assume that there is no hydrogen in the air. The plate is left in the air and the hydrogen concentration varies with the time as follows: (-9n² Dt' exp 4Co 3nx C(x, t) = sin %3D where I is the thickness of the plate. If we would like to remove 95% of the hydrogen from the plate, how long will it take when the plate is at 25 °C? The pre-exponential and activation energy for hydrogen in a-iron are 0.1 mm²/s and 13,400 J/mol, respectively.