Question

What is the partial pressure of oxygen in a gas mixture that is 40% oxygen, 40% argon, and 20% helium? The total atmospheric pressure of the gas is 1,000 mm Hg.

Answer 1

Answer:

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Explanation:

• Convert pressure to same units so 780 torr=1.03 atm. Subtract water vapor pressure from total pressure to get partial pressure of gas A: PA=1.03 atm- 1 atm=0.03 atm.
• There are two ways to calculate partial pressures: 1)Use PV = nRT to calculate the individual pressure of each gas in a mixture. 2)Use the mole fraction of each gas to calculate the percentage of pressure from the total pressure assignable to each individual gas.