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Gas Laws Review

Gas Laws Review. (1). A sample of helium has a volume of 3 liters when the pressure is 500 torr. What volume does the gas occupy at 300 torr?. (1) ANSWER. 5 L. (2). How are pressure and temperature related?. (2) ANSWER. Directly proportional. (3).

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Gas Laws Review

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  1. Gas Laws Review

  2. (1) • A sample of helium has a volume of 3 liters when the pressure is 500 torr. What volume does the gas occupy at 300 torr?

  3. (1) ANSWER • 5 L

  4. (2) • How are pressure and temperature related?

  5. (2) ANSWER • Directly proportional

  6. (3) • How would you convert a Celsius temperature to a Kelvin temperature?

  7. (3) ANSWER • Add 273

  8. (4) A child receives a balloon filled with 2.30 L of helium from a vendor at an amusement park. The temperature outside is 311 K. What will be the volume of the balloon when the child brings it home to an air-conditioned house at 295 K?

  9. (4) ANSWER • 2.18 L

  10. (5) A small 2.00 L fire extinguisher has an internal pressure of 506.6 kPa at 25.0°C. What volume of methyl bromide, the fire extinguisher’s main ingredient, is needed to fill an empty fire extinguisher at standard pressure if the temperature remains constant?

  11. (5) ANSWER 10.0 L (9.97 L if converted to atm to solve)

  12. (6) At a deep sea station 200. m below the surface of the Pacific Ocean, workers live in a highly pressurized environment. How many liters of gas at STP on the surface (which is at atmospheric pressure) must be compressed to fill the underwater environment with 2.00 x 107 liters of gas at 20.0 atm?

  13. (6) ANSWER • 4.00 x 108 L

  14. (7) • How are pressure and volume related?

  15. (7) ANSWER • Inversely proportional

  16. (8) Suppose you have a 500. mL container that contains 0.0500 mol of oxygen gas at 25.0oC. What is the pressure inside the container?

  17. (8) ANSWER • 2.45 atm

  18. (9) 2 points How many grams of oxygen gas in a 10.0 L container exert a pressure of 97.0 kPa at a temperature of 25.0 °C ?

  19. (9) ANSWER • 12.5 g O2

  20. (10) A helium balloon has a volume of 500. mL at STP. What will be it new volume if the temperature is increased to 325 K and its pressure is increased to 125 kPa?

  21. (10) ANSWER • 0.483 L

  22. (11) • TRUE OR FALSE: At higher temperatures, gases have lower kinetic energies

  23. (11) ANSWER • False

  24. (12) The air in a balloon has a volume of 3.00 L and exerts a pressure of 101 kPa at 300.0K. What pressure does the air in the balloon exert if the temperature is increased to 400.0 K and the air is allowed to expand to 15.0 L?

  25. (12) ANSWER • 26.9 kPa

  26. (13) • How are volume and temperature related?

  27. (13) ANSWER • Directly proportional

  28. (14) • What is the device called that measures atmospheric pressure?

  29. (14) ANSWER • Barometer

  30. (15) 2 pts • Who invented the barometer?

  31. (15) ANSWER • Evangelista Torricelli

  32. (16) • How many moles of gas occupy 98 L at a pressure of 2.8 atm and a temperature of 292 K?

  33. (16) ANSWER • 11 moles

  34. (17) • What is the difference between STP and standard conditions?

  35. (17) ANSWER • STP is 273 K (OoC) and 1 atm • Standard conditions is 298 K (25oC) and 1 atm

  36. (18) • TRUE OR FALSE: Gas molecules strongly attract one another.

  37. (18) ANSWER • False

  38. (19) 2 points • Which 2 properties of gases explain why you can smell air freshener across a room.

  39. (19) ANSWER • 1) Gases diffuse through other gases • 2) Gases uniformly fill their container

  40. (20) 2 pts • At STP a tank is filled with 22.4-L nitrous oxide. How many moles of gas are in the tank when the volume changes to 17.4 L?

  41. (20) ANSWER • 0.777 mol

  42. (21) 3 points • A 4.25 g sample of fluorine at STP is in a sealed container. When the pressure changes to 0.25 atm and the temperature drops to 200. K, what is the new volume?

  43. (21) ANSWER • 7.3 L • 7.4 L acceptable

  44. (22) 2 points • The pressure of a gas changes form 120 kPa to 50 kPa. The volume changes from 45 L to 40. L. If the initial temperature is 81oC, what is Mrs. Ward’s favorite number?

  45. (22) ANSWER • 2

  46. (23) What volume of 44.01 mol of carbon dioxide gas is present at STP?

  47. (23) ANSWER • 22.4 L

  48. (24) *HONORS* • If 5.0 moles of O2 and 3.0 moles of N2 are placed in a 30.0 L tank at a temperature of 25oC, what will the pressure of the resulting mixture of gases be?

  49. (24) ANSWER • 6.5 atm

  50. (25) *HONORS* • The mole fraction of helium in a tank full of helium, neon, and krypton gases is 0.256. What is the total pressure in the tank if the partial pressure of helium is 0.500 atm?

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