logging in or signing up Pressure & Dalton's Law bsndev Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 1048 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: August 25, 2009 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: hassanh (16 month(s) ago) hi Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Gases : Gases Pressure & Dalton’s Law of Partial Pressures Pressure : Pressure When gas particles collide with the walls of their container, they exert a force This force is called pressure Pressure is determined by: Number of gas particles Temperature of the gas Standard Atmospheric Pressure : Standard Atmospheric Pressure 101.325 kPa 760 mmHg 760 torr 14.7 psi 1 atm 29.92 inHg All of these representthe same pressure – Standard AtmosphericPressure – just in different pressure units Converting Pressure Units : Converting Pressure Units Write down what you’re given Conversion factor: Cancel units and solve Example : Example Convert: 477 kPa = ___________ torr What would the pressure 26.5 psi be if it were expressed in units of in Hg? Measuring Pressure : Measuring Pressure Pressure Gauge – used to measure the pressure of a gas inside a container (bike tire, basketball, oxygen tank, etc.) Manometer – measures the pressure of a sample gas Open – compared to atmospheric pressure Closed – absolute measure Dalton’s Law of Partial Pressures : Dalton’s Law of Partial Pressures In a mixture of gases, the total pressure of the mixture equals the sum of the individual gas pressures Ptotal = Pgas1 + Pgas2 + … + Pgasn When a gas is collected over water, you have a mixture of your sample gas as well as water vapor Slide 8: When dealing with a gas collected over water, you must determine the pressure of the dry gas Pgas = Ptotal - Pwater Determine Pwater by looking at a table of Water Vapor Pressure values Water’s vapor pressure at various temperatures : Water’s vapor pressure at various temperatures Dalton’s Law Example : Dalton’s Law Example A quantity of gas is collected over water at 8ºC. The manometer indicates a pressure of 84.5 kPa. What would the pressure of the dry gas be at 8ºC? Pgas(P1) = Ptotal – Pwater = 84.5 kPa – 1.1 kPa = 83.4kPa Pwater = 1.1 kPa You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Pressure & Dalton's Law bsndev Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 1048 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: August 25, 2009 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: hassanh (16 month(s) ago) hi Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Gases : Gases Pressure & Dalton’s Law of Partial Pressures Pressure : Pressure When gas particles collide with the walls of their container, they exert a force This force is called pressure Pressure is determined by: Number of gas particles Temperature of the gas Standard Atmospheric Pressure : Standard Atmospheric Pressure 101.325 kPa 760 mmHg 760 torr 14.7 psi 1 atm 29.92 inHg All of these representthe same pressure – Standard AtmosphericPressure – just in different pressure units Converting Pressure Units : Converting Pressure Units Write down what you’re given Conversion factor: Cancel units and solve Example : Example Convert: 477 kPa = ___________ torr What would the pressure 26.5 psi be if it were expressed in units of in Hg? Measuring Pressure : Measuring Pressure Pressure Gauge – used to measure the pressure of a gas inside a container (bike tire, basketball, oxygen tank, etc.) Manometer – measures the pressure of a sample gas Open – compared to atmospheric pressure Closed – absolute measure Dalton’s Law of Partial Pressures : Dalton’s Law of Partial Pressures In a mixture of gases, the total pressure of the mixture equals the sum of the individual gas pressures Ptotal = Pgas1 + Pgas2 + … + Pgasn When a gas is collected over water, you have a mixture of your sample gas as well as water vapor Slide 8: When dealing with a gas collected over water, you must determine the pressure of the dry gas Pgas = Ptotal - Pwater Determine Pwater by looking at a table of Water Vapor Pressure values Water’s vapor pressure at various temperatures : Water’s vapor pressure at various temperatures Dalton’s Law Example : Dalton’s Law Example A quantity of gas is collected over water at 8ºC. The manometer indicates a pressure of 84.5 kPa. What would the pressure of the dry gas be at 8ºC? Pgas(P1) = Ptotal – Pwater = 84.5 kPa – 1.1 kPa = 83.4kPa Pwater = 1.1 kPa