1. Gas Law Relay Races!
Chapter 14.2

2. Problem 1
A constant volume of oxygen is heated from 100C to 185C. The initial pressure is 4.1 atm. What is the final pressure?

3. Answer 1
5.03 atm

4. Problem 2
A gas occupies 3.5L at 2.5 mm Hg pressure. What is the volume at 10 mm Hg at the same temperature?

5. Answer 2
0.875 L

6. Problem 3
A sample of 25L of NH3 gas at 10C is heated at constant pressure until it fills a volume of 50L. What is the new temperature in C?

7. Answer 3
566 Kelvin or 293 C

8. Problem 4
In a certain experiment a sample of helium in a vacuum system was compressed at 25 C from a volume of mL to a volume of L, where its final pressure was found to be 30.0 mmHg. What was the original pressure of the helium?

9. Answer 4
36 mmHg

10. Problem 5
An ideal gas occupies L at 270 mm Hg and 65C. If the pressure is changed to 1064 mmHg and the temperature is increased to 100C, what is the new volume?

11. Answer 5
119 L

12. Problem 6
A L balloon is filled with helium at 700mm Hg barometric pressure. The balloon is released and climbs to an altitude where the barometric pressure is 400mm Hg. What will the volume of the balloon be if, during the ascent, the temperature drops from 24 to 5C?

13. Answer 6
0.983 L

14. Problem 7
An unknown gas has a volume of 50L at 5 atm and -140C. What is its volume at STP (standard temp = 273K, standard pressure = 1 atm) ?

15. Answer 7
513 L

16. Problem 8
In an autoclave, a constant amount of steam is generated at a constant volume. Under 1.00 atm pressure the steam temperature is 100C. What pressure setting should be used to obtain a 165C steam temperature for the sterilization of surgical instruments?

17. Answer 8
1.17 atm

18. Problem 9
Explain what each of the following changes would do to the pressure in a closed container (increase or decrease pressure). A) Part of the gas is removed, B) The container size (volume) is decreased, and C)Temperature is increased.

19. A) Pressure Decrease B) Pressure Increase C) Pressure Increases
Answer 9
A) Pressure Decrease
B) Pressure Increase
C) Pressure Increases

20. Problem 10
Find the volume of a gas at 800 mmHg and 40.0 C if its volume at 710 mmHg and 15 C is 6.84 L.

21. Answer 10
6.60 L