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Which of the following gases has the highest average speed at 350 k?

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Answer:

The gas with the highest average speed at 350 K is the one with the lowest molar mass. This is because the average speed of a gas molecule is directly proportional to the square root of its temperature and inversely proportional to the square root of its molar mass. So, the gas with the lowest molar mass will have the highest average speed.

Therefore, helium will have the highest average speed at 350 K.

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