Which is an example of a free expansion of a gas? the expansion of a gas due to a chemical reaction among its particles the uncontrolled expansion of a gas into a vacuum the expansion of a gas as it performs work on its container the expansion of a gas as heat is transfered to it at constant pressure

Free expansion refers to uninhibited or provoked expansion, i.e. it’s expanding on its own, by itself. The only situation in which this occurs is B, as the gas is allowed to expand by itself. A involves a reaction that forces the expansion, C involves the gas performing work, and D involves thermal expansion.

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The answer is conduction