The air we breathe into our lungs is a mixture of gases. While the atmosphere is mostly composed of nitrogen and oxygen, there are other gases too. One of these is a monatomic gas that has an rms speed of 428 m/s in your lungs at 20.0 °C. (a) Calculate its molecular weight. (b) What gas is this? (a) Number (b) i Units

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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.