Helium is mixed with oxygen gas for deep-sea divers. Calculate the percent by volume of oxygen gas

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Helium is mixed with oxygen gas for deep-sea divers. Calculate the percent by volume of oxygen gas in the mixture if the diver has to submerge to a depth where the total pressure is 4.2 atm. The partial pressure of oxygen is maintained at 0.20 atm at this depth.
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Chemistry

ISBN: 978-0077274313

10th edition

Authors: Raymond Chang

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