Question

a small amount of gas is let into a large evacuated chamber. how much of the chamber gets filled with the gas? what property of the gas helps it to do so

Answer 1

a small amount of gas is let into a large evacuated chamber.the whole of the chamber will get filled by the gas.

Gases have least molecular interaction between their molecules n this property helps them spread throughout the room

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Answer 2

The chamber is filled uniformly. This would be the case even if the chamber were not evacuated.

Dalton's Law of Partial Pressures  holds that in a gaseous mixture, the partial pressure exerted by a component gas is the same as the pressure it would exert if it alone occupied the container. This is the experimental result: the gas expands to fill the entire chamber.

The second part is that

The intermolecular space in gases is loose which helps gasses to freely move around. So they spread in the entire room.

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