Gas Laws

1. Gas Laws Conceptual Examples and Concepts Basic Problem Solving

2. Conceptual Examples: Avogadro’s Law Everyday Example? • If you double the number of moles in a container while holding temperature and pressure constant, what happens to the volume? • A) It stays the same • B) It doubles • C) It halves • D) It quadruples • E) It increases by unknown quantity.

3. Conceptual Examples: Boyles Everyday Example? • If you double the size of a container while holding temperature and moles constant, what happens to the pressure? • A) It stays the same • B) It doubles • C) It halves • D) It quadruples • E) I don’t know.

4. Conceptual Examples: Charles Law Everyday Example? • If you halve the temperature while holding moles and pressure constant. What happens to the volume? • A) It stays the same • B) It doubles • C) It halves • D) It quadruples • E) It decreases by unknown quantity

5. Ideal Gas Law • A 250. mL aerosol can at 25 C and 1.10 atm was thrown into an incinerator. When the temperature in the can reached 712 C, it exploded. What was the pressure in the can just before it exploded, assuming it reached the maximum pressure possible at that temperature (aka, assuming its an ideal gas)?

6. With hindsight, Harrison Okene probably should have seen the signs. All of the ingredients were in place: He was young, happy, and gainfully employed as a cook on a Chevron service tugboat. Also, he was about to get married in a few days. All he had to do before his wedding was finish this one ... last ... mission.Of course, said mission turned into the most terrifying disaster movie this side of the SS Poseidon. In the early morning of May 26, 2013, Okene had just gotten up and was in the bathroom. Suddenly, his ship was hit by what a spokesman later called a "sudden ocean swell" (which is presumably corporate speak for "Shit, we accidentally summoned Cthulhuagain"). Okene could only watch helplessly as his daily life turned into a trip to Rapture. The tugboat capsized and plummeted 100 feet below the surface, with him still inside. Trapped in the dark abyss with no one else in sight and wearing nothing but his boxers, Okene waded through the ship's corridors (which were slowly filling with icy water). He managed to locate a source of light, some Coca-Cola, and a few tools, and he made it to a relatively safe corner of the ship. Okene ended up bunking in a 4-foot air pocket under the surface, holding back the water as best he could and stacking mattresses as the cold water rose to keep dry. To make things worse, sharks and barracudas soon started roaming the ship's interiors in search of a meal. He could hear them fighting for the remains of his shipmates in other rooms and swimming in the water just below him. He had no food. The salt water and the bumps from the accident were wearing his skin raw. There was far too little air for him to breathe, and he was ruining it with every breath by puffing out carbon dioxide. He would not last beyond a couple of hours. Except that he totally did. In fact, he managed to stay alive for 62 hours. Here's how: ****Exerpt taken from Cracked.com “Survival stories almost too miraculous to be real”****

7. Challenge Question: What is the minimum size of the chamber?Note: we know its 4ft high Given that the average human needs about 11,000 liters of air per day, and air is approximately 20% oxygen determine the minimum amount of moles of oxygen that must have been present in the bubble. At 30 meters (depth of the boat sinking) the pressure is 4 atm, assume the water was 60 F (15.5 C). Determine the volume that the amount of air you calculated above would take. Given that Volume and assuming a square area:

8. What assumptions did we make? Are these valid? So what is the verdict when all these assumptions are factored in? A space of about 25-177 m3 is required.