A balloon contains 0.76 mol N₂,0.18 mol O₂,0.031 mol He and 0.026 mol H₂ at 749 mm Hg.What is the partial pressure of O₂? A)20 mm Hg B)23 mm Hg C)140 mm Hg D)570 mm Hg

Question

Quizplus · Accepted Answer

The partial pressure of a gas is equal to the total pressure multiplied by the mole fraction of that gas. The mole fraction of O2 is 0.18 / (0.76 + 0.18 + 0.031 + 0.026) = 0.18 / 1.0 = 0.18. Therefore, the partial pressure of O2 is 749 mm Hg * 0.18 = 140 mm Hg.

A Balloon Contains 0