1 / 11

Chapter 14.2+.3

Chapter 14.2+.3. Combined Gas Law and Ideal Gases. Combined Gas Law. Equation V 1 x P 1 = V 2 x P 2 T 1 T 2 Solve for T 2 , V 2 , or P 2. The volume of a gas filled balloon is 30.0 L at 313 K and 153 kPa. What would be the volume at STP?. Hint: What is P, T at STP?

markku
Download Presentation

Chapter 14.2+.3

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. Chapter 14.2+.3 Combined Gas Law and Ideal Gases

  2. Combined Gas Law Equation V1 x P1 = V2 x P2 T1 T2 Solve for T2, V2, or P2

  3. The volume of a gas filled balloon is 30.0 L at 313 K and 153 kPa. What would be the volume at STP? Hint: What is P, T at STP? V1 = 30.0L V2=? T1=313 K T2=273K P1=153 kPa P2=101.3kPa V2=P1 x V1 x T2 =153x30.0x273 = 39.5L P2 x T1 101.3 x 313

  4. Ideal Gas Law • Combined gas laws plus n = number of moles R = ideal gas constant, 8.31 (L kPa/K mol) is given to you in tests…. PV = nRT Solve for n=

  5. An underground cavern contains 2,356 L methane gas CH4 at a pressure of 150 kPa and a temperature of 315 K. How many moles of CH4 does the cavern contain? • P = 150 kPa • V = 2,356 L • T = 315 K • R = 8.13 L kPa/K mol n = 150 x 2,356 = 135 moles 8.13 x 315

  6. Real gases behave differently from ideal gases Because real gas particles… • have a volume. • are attracted to each other, especially if compressed. • Turn into a liquid when pressure is high enough or temperature is low enough.

  7. Portions below curve due to intramolecular attractions • Portions above curve due to particles having a volume

  8. Gas Laws and Diving • Air contains 70% nitrogen • Due to high pressure under water, nitrogen dissolves in the blood ►nitrogen narcosis results. The greater the depth, the more nitrogen dissolves. • Nitrogen interferes with nerve impulses, causes dizziness, and slow reactions.

  9. Decompression Sickness • When a diver surfaces rapidly, the nitrogen leaves the blood suddenly; little bubbles form all over the body, blocking arteries and blood flow, causing nausea, pain, vomiting. • Divers coming from high depth have to sit in a decompression chamber that gradually lowers the air pressure.

  10. Use of dive tables • calculating decompression stops and gas mixture, less N2 in air when diving high depth

  11. Practice • How many grams of Oxygen are contained in a 40 liter tank under 1000 kPa at -10oC? • Hint: solve for n then convert into g – use PT

More Related