Hydrogen gas at 85°C is maintained at constant pressures of 5 atm and 3 atm on opposite sides of a 0.1-mm-thick nickel wall. Determine the molar diffusion rate per unit area through the nickel wall.

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Hydrogen 85°C, 5 atm Nickel wall PHh₂ L PH₂ Hydrogen 85°C, 3 atm