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A gas containing 80%CH4 and 20%He is sent through a quartz diffusion tube to recover the helium. Twenty percent by weight of the original gas

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A gas containing 80%CH4 and 20%He is sent through a quartz diffusion tube to recover the helium. Twenty percent by weight of the original gas is recovered, and its composition is 50%He. Calculate the composition of the waste gas if 100kg moles of gas are processed per minute

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