Of the following, the best explanation for the fact that most gases are easily compressed is that th — States of Matter Chemistry Question

STEPS:

1. Identify the physical property being explained: The question asks for the best explanation of why gases are easily compressed (i.e., why their volume can be dramatically decreased by applying an external force or pressure).
2. Recall the Kinetic Molecular Theory (KMT) of gases: A key postulate of KMT is that gas particles are incredibly small compared to the vast distances that separate them. This means that a gas sample consists almost entirely of empty space, and the actual volume of the gas molecules themselves is negligible compared to the total volume of the container.
3. Relate molecular spacing to compressibility: Because gas molecules are relatively far apart and surrounded by empty space, applying pressure easily pushes the individual molecules closer together, drastically reducing the overall volume.
4. Select the correct option: The vast empty space between gas molecules is the direct physical explanation for compressibility, making Option B the correct choice.

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WHY_OTHERS_WRONG:

• A is incorrect: Although gas molecules are indeed in constant motion, this motion explains why gases expand to fill their containers and exert pressure on their surroundings. It does not explain why they can be compressed.
• C is incorrect: While gas molecules can have relatively small masses, the mass of the particles determines their speed (root-mean-square speed) and rate of effusion. It has no bearing on the compressibility of the gas sample.
• D is incorrect: The fact that real gas molecules have a real, nonzero volume is a characteristic of real (non-ideal) gases. However, having a real volume actually *limits* compressibility, as the volume of the molecules themselves defines the lower limit to which the gas can be compressed.
• E is incorrect: It is a thermodynamic fact that gas molecules move slower as temperature decreases, but this relationship does not explain the physical mechanism of gas compressibility.