AP Chemistry Flash Cards - States of Matter: Gases

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devon.orourke
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77705
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AP Chemistry Flash Cards - States of Matter: Gases
Updated:
2011-04-06 00:31:02
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Descriptive chem gases
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Gases
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  1. What is the pressure exerted by 5 moles of gas in a 40 L container at 300 K?
    Using the ideal gas equation, you can calculate the pressure exerted by the gas is about 3.1 atm.
  2. How many atoms of a substance are in 1 mole of that substance?
    In 1 mole of a given substance, there are 6.02 x 1023 atoms.
  3. On the periodic table, the masses given for the elemetns are masses for what quantity of the element?
    The masses for the elements are the masses for 1 mole o the element.
  4. What is the ideal gas equation?
    PV = nRT
  5. What is the value of the ideal gas constant, R?
    • The value of R depends on the units. The two most common values are:
    • 1. 0.0821 (L atm / mol K)
    • 2. 8.314 (J / mol K)
  6. Suppose that a gas is kept at 0.3 atm in a container with a volume of 5 L. If this gas is transferred to a container with a volume of 3 L at a constant temperature, what will be the new pressure exerted by the gas?
    Using Boyle's law, you can determine that the new pressure is 0.5 atm.
  7. At constant pressure, a gas that occupies 4 L is heated from 200 K to 300 K. How much volume will the gas now occupy?
    Using Charles' law, you can determine that the new volume is 6 L.
  8. A gas at 300 K exerts a pressure of 2 atm within a 30 L container. Approximately how many moles of gas are there?
    Using the ideal gas law, you can calculate that the amount of gas present is equal to about 2.5 moles.
  9. A container holds 3 moles of hydrogen gas (H2), 1 mole of oxygen gas (O2), and 4 moles of nitrogen gas (N2). What is the mole fraction of the hydrogen gas?
    The mole fraction of hydrogen is 3/8.
  10. A container holds 3 moles of hydrogen gas (H2), 1 mole of oxygen gas (O2), and 4 moles of nitrogen gas (N2). If the total pressure of the system is 4 atm, what is the partial pressure of the hydrogen gas?
    Using Dalton's law of partial pressure, you can calculate that the partial pressure of hydrogen is equal to 1.5 atm.
  11. A container holds neon gas, hydrogen gas, and oxygen gas. If the partial pressure of the neon is 0.75 atm, the partial pressure of the hydrogen gas is 1.25 atm, and the total pressure of the system is 4 am, what is the partial pressure of the H2?
    Using Dalton's law of partial pressure, you can calculate that the partial pressure of H2 is 1.25 atm.

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