10: The Mole
- Page ID
- 53764
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The mole is the unit of measurement in the International System of Units (SI) for amount of substance. It is defined as the amount of a chemical substance that contains as many elementary entities (e.g., atoms, molecules, ions, electrons, or photons). This number is expressed by the Avogadro constant, which has a value of \(6.022140857 \times 10^{23} \;mol^{-1}\). The mole is one of the base units of the SI, and has the unit symbol mol.
- 10.8: Gas Density
- As you know, density is defined as the mass per unit volume of a substance. Since gases all occupy the same volume on a per mole basis, the density of a particular gas is dependent on its molar mass. A gas with a small molar mass will have a lower density than a gas with a large molar mass. Gas densities are typically reported in g/L . Gas density can be calculated from molar mass and molar volume.