Chapter 11 Lecture Basic Chemistry Fourth Edition Chapter
Chapter 11 Lecture Basic Chemistry Fourth Edition Chapter 11 Gases 11. 6 Combined Gas Law Learning Goal Use the combined gas law to find the final pressure, volume, or temperature of a gas when changes in two of these properties are given and the amount of gas is constant. © 2014 Pearson Education, Inc.
Combined Gas Law Combined gas law • incorporates all pressure-volume-temperature relationships for gases previously studied • is useful for studying the effect of changes in two of these variables on the third variable, while the amount remains constant © 2014 Pearson Education, Inc.
Summary of Gas Laws © 2014 Pearson Education, Inc.
Learning Check Helium gas has a volume of 0. 180 L, a pressure of 0. 800 atm, and a temperature of 29 °C. At what temperature (°C) will the gas have a volume of 90. 0 m. L and a pressure of 3. 20 atm? © 2014 Pearson Education, Inc.
Solution Helium gas has a volume of 0. 180 L, a pressure of 0. 800 atm, and a temperature of 29 °C. At what temperature (°C) will the gas have a volume of 90. 0 m. L and a pressure of 3. 20 atm? Step 1 Organize the data in a table of initial and final conditions. Conditions 1 Conditions 2 P 1 = 0. 800 atm P 2 = 3. 20 atm V 1 = 0. 180 L (180. m. L) V 2 = 90. m. L T 1 = 29 °C + 273 = 302 K T 2 = ? © 2014 Pearson Education, Inc.
Solution Helium gas has a volume of 0. 180 L, a pressure of 0. 800 atm, and a temperature of 29 °C. At what temperature (°C) will the gas have a volume of 90. 0 m. L and a pressure of 3. 20 atm? Step 2 Rearrange the gas law equation to solve for the unknown quantity. © 2014 Pearson Education, Inc.
Solution Helium gas has a volume of 0. 180 L, a pressure of 0. 800 atm, and a temperature of 29 °C. At what temperature (°C) will the gas have a volume of 90. 0 m. L and a pressure of 3. 20 atm? Step 3 Substitute values into gas law equation and calculate. © 2014 Pearson Education, Inc.
Learning Check A gas has a volume of 675 m. L at 35 °C and 0. 850 atm pressure. What is the volume (m. L) of the gas at − 95 °C and a pressure of 802 mm. Hg? © 2014 Pearson Education, Inc.
Solution A gas has a volume of 675 m. L at 35 °C and 0. 850 atm pressure. What is the volume (m. L) of the gas at − 95 °C and a pressure of 802 mm. Hg? Step 1 Organize the data in a table of initial and final conditions. Conditions 1 Conditions 2 P 1 = 0. 850 atm P 2 = 802 mm. Hg = 1. 06 atm V 1 = 0. 675 m. L V 2 = ? T 1 = 35 °C + 273 = 308 K T 2 = − 95 °C + 273 = 178 K © 2014 Pearson Education, Inc.
Solution A gas has a volume of 675 m. L at 35 °C and 0. 850 atm pressure. What is the volume (m. L) of the gas at − 95 °C and a pressure of 802 mm. Hg? Step 2 Rearrange the gas law equation to solve for the unknown quantity. © 2014 Pearson Education, Inc.
Solution A gas has a volume of 675 m. L at 35 °C and 0. 850 atm pressure. What is the volume (m. L) of the gas at − 95 °C and a pressure of 802 mm. Hg? Step 3 Substitute values into gas law equation and calculate. © 2014 Pearson Education, Inc.
- Slides: 11