At very low temperatures, molecular speeds can still be large. The table below shows mass and temperature data for three different gases. The specified temperatures are each one degree above the boiling point for the substance. Part (a)  What is the rms speed. in meters per second, for atoms of helium gas at the temperature specified in the table?  Part (b)  What is the ratio of the rms speed of the hydrogen molecules to that of the oxygen molecules? (Calculate each at its respective temperature from the table.)

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Q: At what pressure will the mean free path in room-temperature (20°C) nitrogen be 1.3 m ?

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Diatomic Gas

Molecule, is a collection of two or more atoms together (which constitute the smallest observable unit) into a pure material. There are some ways to represent the structure of a molecule. Factor symbols represent atoms in Lewis structures, and dots represent electrons that accompany them. A pair of mutual electrons (covalent bond) may be represented by a single dash. The ball-and-stick model depicts the spatial structure of the atoms better.