Question: could you help me with this question please and thank you Pure helium gas is stored at 20C in the cylindrical Pyrex tank of 2m

could you help me with this question

please and thank you

Pure helium gas is stored at 20C in the cylindrical Pyrex tank of 2m in length with an inner diameter of 12cm and a wall thickness of 2.5mm. A helium detector situated beside the tank has detected a steady leakage of helium at 1.8106g over the duration of an hour. Assume that both ends of the tank are impermeable surfaces and the concentration of helium at the tank outer surface is negligible. (a) Determine the concentration of helium at the inner surface of the tank

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