A balloon contains 0.76 mol N2, 0.18 mol O2, 0.031 mol He and 0.026 mol H2...

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Chemistry

A balloon contains 0.76 mol N2, 0.18 mol O2, 0.031 mol He and0.026 mol H2 at 749 mm Hg. What is the partial pressure of O2?

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4.1 Ratings (436 Votes)

mole fraction of O2 = moles of O2 / total moles

                                = 0.18 / (0.76 + 0.18 + 0.031 + 0.026)

                                = 0.18 / 0.997

                               = 0.1805

partial pressure of O2 = mole fraction x total pressure

                                    = 0.1805 x 749

partial pressure of O2 = 135 mm Hg


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