Which of the following statements are evidence that gases do not always behave ideally? Check all that apply.?

NetherCraft 0

A. CO2 gas becomes dry ice (solid CO2) at 1 atm and –78.5 °C.

B. When two gases are mixed, they follow Dalton’s law of partial pressures.

C. At 4 K and 1 atm, helium is a liquid.

D. It is impossible to compress a gas enough so that it takes up no volume.

1 Answer

  • A, C and D. Ideal gas law states that the mass of the gas is negligible compared to the volume of the container (negating D), and there are no inter-particle attractions (A&C). So when the gas is not ideal, it will attract other molecules and form liquids and solids.

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