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I need it in 5-10 mins Oxygen flow through the tube into a 20-liter flask filled air and the mixture of oxygen gas and air

I need it in 5-10 mins

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Oxygen flow through the tube into a 20-liter flask filled air and the mixture of oxygen gas and air flows out through another tube, The flow is slow enough so that the concentration of the mixture is kept uniform. If the air initially contains 21% oxygen, what will be the % of oxygen gas in the flask after 50 liters have passed through

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