What is the ideal gas equation?

pV = nRT


p = pressure (Pa)

V = volume (m3)

n = number of moles (mol)

R = ideal gas constant (J mol-1 K-1)

T = temperature (K)

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What are the units of pressure, volume and temperature in the ideal gas equation?

Pressure: Pa

Volume: m3

Temperature: K

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List 5 assumptions made about an ideal gas.

The 5 assumptions about an ideal gas are:

  1. The motion of gas molecules is rapid and random.
  2. The molecules of an ideal gas occupy a negligible volume compared to the empty space between them.
  3. There are no intermolecular forces of attraction between gas molecules.
  4. All collisions between molecules are elastic.
  5. The average kinetic energy of the gas depends only on its temperature.

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Give 4 versions of the ideal gas equation in the format:

1p = 

2V = 

3n = 

4T = 

  1. p = VnRT​
  2. V = pnRT​
  3. n = RTpV​
  4.  T = nRpV​

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How do you convert between units of dm3 and m3?

To convert from dm3 into m3, divide by 1,000.

To convert from m3 into dm3, multiply by 1,000.

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What are the two main reasons real gases do not always follow ideal gas predictions perfectly?

  1. Intermolecular attractions exist between particles.
  2. The volume of the actual gas particles cannot be ignored.

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