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Definition for A.M.S
Definitions for Atoms, Molecules and Stoichiometry
Term | Definition |
---|---|
Relative Molecular Mass (Mr) | The relative molecular mass of a molecule is defined as the average mass of one molecule compared to 1/12 the mass of a carbon-12 atom. |
Relative Formula Mass (Mr) | The relative formula mass of an ionic compound is defined as the average mass of one formula unit compared to 1/12 the mass of a carbon-12 atom. |
Relative Isotopic Mass (Ar) | The relative isotopic mass of an isotope (of a certain element) is defined as the mass of one isotope compared to 1/12 the mass of a carbon-12 atom. |
Relative Atomic Mass (Ar) | The relative atomic mass of a certain element is defined as the average mass of one atom compared to 1/12 the mass of a carbon-12 atom. |
Empirical Formula | The empirical formula of a chemical compound shows the simplest whole number ratio for the atoms of different elements present in the compound. |
Molecular Formula | The molecular formula of a chemical compound shows the actual number of atoms of the different elements in one molecule of the compound. |
Mole | A mole is defined as the amount of substance that contains as many particles (atoms, ions, molecules, formula units) as there are atoms in 12.0g of carbon-12. |