Homework Help: Chemistry

Posted by Ellen on Sunday, October 10, 2010 at 9:34pm.

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 721mmHg?
Express your answer numerically as a percentage.

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