Molecular mass or molecular weight refers to the mass of a molecule. It is calculated as the sum of the mass of each constituent atom multiplied by the number of atoms of that element in the molecular formula. The molecular mass of small to medium size molecules, measured by mass spectrometry, determines stoichiometry. For large molecules such as ...
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The sum of the atomic masses of all atoms in a molecule, based on a scale in which the atomic masses of hydrogen, carbon, nitrogen, and oxygen are 1, 12, 14, and 16, respectively. For example, the molecular mass of water, which has two atoms of hydrogen and one atom of oxygen, is 18 (i.e., 2 + 16).
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http://www.cancer.gov/dictionary?expand=M
is the sum of the atomic masses of all the atoms in a molecule.
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http://www.chemicalglossary.net/definition/1126-MOLECULAR_MASS
Synonym for molecular weight ... The sum of the atomic weight's of all the atoms constituting a molecule; the mass of a molecule relative to the mass of a standard atom, now 12C (taken as 12.000). Relative molecular mass (Mr) is the mass relative to the dalton and has no units. ... See: atomic weight. ... Synonym: molecular mass, molecular weight r...
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http://www.encyclo.co.uk/local/20973
Type: Term Synonyms: molecular weight
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Mass of a molecule, calculated relative to one-twelfth the mass of an atom of carbon-12. It is found by adding the relative atomic masses of the atoms that make up the molecule
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https://www.encyclo.co.uk/local/21221
The molecular mass (abbreviated M) of a substance, frequently referred to by the older term molecular weight and abbreviated as MW, is the mass of one molecule of that substance, relative to the unified atomic mass unit u[1] (equal to 1/12 the mass of one isotope of carbon-12[2]). This is distinct from the relative molecular mass of a molecule, whi...
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