When a sample of a gas is cooled it condenses into a liquid. in which of the following ways do the molecules of the original gas sample compare with the molecules of a liquid.

The molecules have shorter inter molecular distances  and less kinetic energy than the original gas sample.

The cooling reduces the kinetic energy of the gas sample and thus the molecules making up the liquid sample travel less distances due to the less energy. The less inter molecular distances increases the attraction due to inter molecular forces packing the molecules near each other, forming a liquid.

b is the correct answer

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it is the most commonly accepted one