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Definition for A.M.S

Definitions for Atoms, Molecules and Stoichiometry

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.
Created by: Gattaca



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