1 / 13

Aim: How is the pressure exerted by a mixture of gases different from the pressure of one gas?

DO NOW: A student fills 2 identical balloons at STP with nitrogen and oxygen gases separately. Which balloon has more molecules? The oxygen above is then cooled to 135K. What pressure is exerted by the oxygen?.

beaue
Download Presentation

Aim: How is the pressure exerted by a mixture of gases different from the pressure of one gas?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. DO NOW: A student fills 2 identical balloons at STP with nitrogen and oxygen gases separately. Which balloon has more molecules?The oxygen above is then cooled to 135K. What pressure is exerted by the oxygen?

  2. Aim: How is the pressure exerted by a mixture of gases different from the pressure of one gas?

  3. Dalton’s Law of Partial Pressure • Partial Pressure—the pressure of one gas in a mixture of gases. • The sum of the partial pressures of the gases in a mixture is equal to the total pressure of the mixture. • Formula: PT = p1 + p2 + p3 +…

  4. Example #1 • A mixture of gases contains 3 gases. Gas A exerts a partial pressure of 1.2 atm, Gas B exerts 0.3 atm, and Gas C exerts 0.8 atm of pressure. What is the total pressure of the gaseous mixture? • PT = 1.2 atm + 0.3 atm + 0.8 atm = 2.3 atm

  5. Vapor Pressure • The pressure of the gas over a liquid in a sealed container. • Vapor pressure of a liquid increases as temperature increases. • Boiling Point—point at which vapor pressure equals atmospheric pressure.

  6. As you increase kinetic energy, the forces holding some of the liquid together get enough energy to break apart and become a gas.There is an increase in vapor pressure as the forces are breaking.Table H also shows you which liquids are stronger (harder to break apart).

  7. Compare propanone and ethanoic acid at 50ºC. • Propanone exerts more vapor pressure. That means its IMFs are weaker and break faster which means it turns into a gas faster.

  8. As the temperature of liquid H2O in a closed system decreases, the vapor pressure • decreases (2) increase (3) remains the same

  9. If the pressure on the surface of propanone in the liquid state is 90 kPa, the liquid will boil at about • 0°C (2) 55°C (3) 80°C (4) 100°C

  10. What is the vapor pressure of a liquid at its normal boiling temperature? • 1 atm (2) 2 atm (3) 273 atm (4) 760 atm

  11. Which property of a sample of mercury is different at 320K than at 300K? (1) atomic mass (3) vapor pressure (2) atomic radius (4) melting point

More Related