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IMU CET Gases — practice questions — page 2

Explore 97 free Gases questions in IMU CET Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Gases questions and exercises with answers

Showing questions 31–60 of 97.

Absolute zero corresponds to which Celsius temperature?Read the answer and worked solution →Charles's law describes which pair of gas properties held at constant pressure?Read the answer and worked solution →A carbon dioxide sample occupies 0.300 L at 10 degrees C and 750 torr. What volume does it occupy at 30 degrees C and 750 torr?Read the answer and worked solution →Boyle's law states that at constant temperature, gas volume relates to pressure in which way?Read the answer and worked solution →Who first published the relationship between the volume and pressure of a gas at constant temperature?Read the answer and worked solution →A gas sample occupies 15.0 mL at 13.0 psi. At constant temperature, what is its pressure when the volume is 7.5 mL?Read the answer and worked solution →Which plot of gas data taken at constant temperature gives a straight line?Read the answer and worked solution →When you inhale, your chest cavity expands. What happens to the pressure inside your lungs?Read the answer and worked solution →For a confined gas at constant pressure and temperature, volume is directly proportional to which quantity?Read the answer and worked solution →Equal volumes of all gases at the same temperature and pressure contain what in common?Read the answer and worked solution →In the ideal gas equation PV = nRT, what does the symbol n stand for?Read the answer and worked solution →Which value of the gas constant R is used when pressure is in atm and volume in litres?Read the answer and worked solution →What volume does 40.8 mol of methane occupy at 25 degrees C and 745 torr? Use R = 0.08206 L atm/mol K.Read the answer and worked solution →Which relation holds for a fixed number of moles of an ideal gas under two sets of conditions?Read the answer and worked solution →A 13.2 L scuba tank holds air at 153 atm and 27 degrees C. What volume does this air occupy in the lungs at 3.13 atm and 37 degrees C?Read the answer and worked solution →Every 33 feet of descent in salt water adds how much pressure for a diver?Read the answer and worked solution →Standard temperature and pressure for reporting gas properties is defined as which pair?Read the answer and worked solution →One mole of an ideal gas at STP occupies approximately what volume?Read the answer and worked solution →Which French chemist is widely regarded as the father of modern chemistry for his quantitative work with gases?Read the answer and worked solution →Which expression gives the density of an ideal gas of molar mass M?Read the answer and worked solution →A gas has a density of 0.0847 g/L at 17.0 degrees C and 760 torr. What is its molar mass?Read the answer and worked solution →A gas is 85.7% carbon and 14.3% hydrogen by mass, and 1.56 g of it fills 1.00 L at 0.984 atm and 50 degrees C. What is its molecular formula?Read the answer and worked solution →Which rearrangement of the ideal gas equation gives the molar mass of a gas?Read the answer and worked solution →A 0.494 g sample of chloroform vapour fills 129 cm^3 at 99.6 degrees C and 742.1 mm Hg. What is its approximate molar mass?Read the answer and worked solution →The total pressure of a mixture of ideal gases equals which quantity?Read the answer and worked solution →What name is given to the pressure exerted by one gas in a mixture?Read the answer and worked solution →The mole fraction of a component in a mixture is defined as which ratio?Read the answer and worked solution →An anaesthetic mixture holds 2.83 mol oxygen and 8.41 mol nitrous oxide at a total pressure of 192 kPa. What is the partial pressure of oxygen?Read the answer and worked solution →A 10.0 L vessel holds 2.50 x 10^-3 mol of hydrogen at 35 degrees C. What is the partial pressure of the hydrogen?Read the answer and worked solution →A gas collected over water is a mixture. How is the pressure of the dry gas found?Read the answer and worked solution →

Worked practice questions

Absolute zero corresponds to which Celsius temperature?

  1. 0 degrees C
  2. 100 degrees C
  3. -273 degrees C
  4. -100 degrees C
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Correct answer: C. -273 degrees C

1. Plotting the pressure of a fixed volume of gas against Celsius temperature gives a straight line. 2. Extending that line downward, the pressure would reach zero at -273 degrees C. 3. No temperature below that point is possible, so -273 degrees C is absolute zero and is 0 on the kelvin scale. 4. This is exactly why every gas law calculation has to use kelvin rather than Celsius. _Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.2 Relating Pressure, Volume, Amount, and Temperature: The Ideal Gas Law_

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Charles's law describes which pair of gas properties held at constant pressure?

  1. Pressure and amount of gas
  2. Pressure and temperature
  3. Pressure and volume
  4. Volume and temperature
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Correct answer: D. Volume and temperature

1. A sealed balloon put in a refrigerator shrinks and swells again when it warms, at constant pressure throughout. 2. Charles's law states that volume is directly proportional to kelvin temperature when pressure is fixed. 3. In symbols this is V1 over T1 equals V2 over T2. 4. Pressure and volume at constant temperature is Boyle's law, so that pairing belongs to a different law. _Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.2 Relating Pressure, Volume, Amount, and Temperature: The Ideal Gas Law_

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A carbon dioxide sample occupies 0.300 L at 10 degrees C and 750 torr. What volume does it occupy at 30 degrees C and 750 torr?

  1. 0.321 L
  2. 0.900 L
  3. 0.280 L
  4. 0.283 L
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Correct answer: A. 0.321 L

1. Pressure is 750 torr before and after, so this is a volume and temperature problem and Charles's law applies. 2. Convert the starting temperature to kelvin: 10 + 273 = 283 K. 3. Convert the final temperature to kelvin: 30 + 273 = 303 K. 4. Apply V1 over T1 equals V2 over T2: 0.300 L / 283 K = V2 / 303 K. 5. Solve: V2 = 0.300 x 303 / 283 = 0.321 L. 6. Heating at constant pressure must expand the gas, so any answer below 0.300 L is wrong on inspection. 7. Using Celsius values would give 0.300 x 30 / 10 = 0.900 L, a threefold jump for a 20 degree warming, which is the trap set here. _Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.2 Relating Pressure, Volume, Amount, and Temperature: The Ideal Gas Law_

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