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Dalton’s Law of Partial Pressures

Dalton’s Law of Partial Pressures. Chapter 11 – Section 2 - Physical Characteristics of Gases. Dalton’s Law of Partial Pressures. Partial Pressure: The pressure of each gas in a mixture Dalton’s Law of Partial Pressures

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Dalton’s Law of Partial Pressures

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  1. Dalton’s Law of Partial Pressures Chapter 11 – Section 2 - Physical Characteristics of Gases

  2. Dalton’s Law of Partial Pressures • Partial Pressure: • The pressure of each gas in a mixture • Dalton’s Law of Partial Pressures • The total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases Ptotal=P1 + P2 + P3 +…..

  3. Dalton’s Law of Partial Pressures • Most often used to determine the pressure of a gas collected by water displacement • Patmosphere = Pgas + Pwater • Water vapor pressure varies with temperature – can be found on page R63

  4. A practice problem • Some hydrogen gas is collected over water at 20.00C. The partial pressure of hydrogen is determined to be 742.5 torr. What is the barometric pressure at the time the gas is collected? • Barometric pressure = Atmospheric pressure • Water vapor pressure is 17.5 torr • Patmosphere = Pgas + Pwater • Patmosphere = 742.5 + 17.5 • Patmosphere = 760.0 torr

  5. Your turn! • Helium gas is collected over water at 25oC. What is the partial pressure of the helium, given that the barometric pressure is 750.0 mmHg? • 726.2 mmHg

  6. Homework • Page 371 10+11

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