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
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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.
