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A balloon contains 0.76 mol N2,0.18 mol O2,0.031 mol He,and 0.026 mol H2 at 739 mm Hg.What is the partial pressure of O2?


A) 19 mm Hg
B) 23 mm Hg
C) 130 mm Hg
D) 560 mm Hg

Correct Answer

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Hydrogen gas is collected over water in an inverted buret.If the atmospheric pressure is 745 mm Hg,the vapor pressure of water is 18 mm Hg,and a 15.0 cm-high column of water remains in the buret,the pressure of the hydrogen gas is


A) 763 mm.
B) 745 mm Hg.
C) 727 mm Hg.
D) less than 727 mm Hg.

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