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How to arrange substances in order of decreasing average molecular speed at 25 centigrade- argon, flurine,CO2,

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THE ANSWER IS helium>oxygen>fluorine>argon>CO2

but I don't know exactly how I can figure it out Please help me step by step

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  1. More massive molecules have a lower speed. Lighter molecules have a higher speed, if all are at the same temperature.

    He = 4.00 g/mole

    O2 = 32.0 g/mole

    F2 = 38.0 g/mole

    Ar = 40.0 g/mole

    CO2 = 44.0 g/mole

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