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Chemistry

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Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of Helium is present in a helium-oxygen mixture having a density of 0.538 g/L at 25 degrees C and 721 mmHg?
Express your answer numerically as a percentage.

  • Chemistry - ,

    sorry. didn't mean to post twice

  • Chemistry - ,

    oxygen

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