medium · MCAT chem-phys

Real gases deviate from the behavior predicted by the Ideal Gas Law (PV = nRT) most significantly at high pressures and low temperatures.

Which of the following best explains why the observed pressure of a real gas is lower than that predicted by the Ideal Gas Law?

  1. Intermolecular attractive forces reduce the impact force of gas molecules against the container walls.
  2. Gas molecules undergo inelastic collisions with each other, gradually losing kinetic energy.
  3. The average kinetic energy of the gas molecules increases as the temperature of the gas falls.
  4. The finite volume occupied by the gas molecules increases the total space available for molecular movement.

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