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If you are comparing the same gas molecules at the same temperature, then the answer is no. They collide more frequently, but only because they are closer than those that are separated by greater distances.

The speed of gas molecules is related to their molecular mass and absolute temperature, not their intermolecular distance. If two different gas molecules (O2 versus H2) are at the same temperature, the lighter one (H2) moves faster. If we compare identical gas molecules (such as O2) at different temperatures, the molecule at the higher temperature moves faster.

What happens to gas molecules that are closer together? Well, if the temperature is cool enough, they will attract each other until they stick together. Eventually enough of them will stick together to form a liquid. They still move, but most of them are not fast enough to separate from each other.

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11y ago
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14y ago

smaller molecule diffuse faster than lage molecules is for sure, but i don't know why.

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12y ago

yes. for example hydrogen molecules will move faster than Nitrogen because hydrogen is lighter is mass.

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16y ago

nope, faster

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15y ago

A small one.

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13y ago

smaller molecules

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13y ago

The smaller molecule will diffuse faster

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Q: Do lighter molecules move faster than heavy ones?
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Why lighter gases diffuse more rapidly than havier gases?

The idea is that they tend to be made up of lighter molecules; on average, these move faster (for a given temperature) than heavier (actually, more massive) molecules.


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