Evidence that a gas consists mostly of empty space is the fact that: (a) the density of a gas becomes much greater when it is liquefied (b) gases exert pressure on the walls of their containers (c) gases are transparent (d) heating a gas increases the molecular motion (e) nature abhors a vacuum

(A) the density of a gas becomes much greater when it is liquefied

Explanation:

The gaseous state is composed of mainly empty space , therefore , the density of the gas increases as it goes to the liquid phase .

As , in the liquid state , the molecules are close together , there by increasing the density of the liquid state .

There fore , from the options , the most appropriate is option a.

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