molecular weight
the average weight of a molecule of an element or compound measured in units once based on the weight of one hydrogen atom taken as the standard or on 1/16 (0.0625) the weight of an oxygen atom, but after 1961 based on 1/12 (0.083) the weight of the carbon-12 atom; the sum of the atomic weights of all the atoms in a molecule. Abbreviation: mol. wt.
Origin of molecular weight
1- Also called formula weight.
Words Nearby molecular weight
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use molecular weight in a sentence
The molecular weight of alcohol in dilute aqueous solution is the same as in vapor form.
The Elements of Qualitative Chemical Analysis, vol. 1, parts 1 and 2. | Julius StieglitzHence the number of grams of a given substance in a liter divided by its molecular weight represents its concentration.
The Elements of Qualitative Chemical Analysis, vol. 1, parts 1 and 2. | Julius StieglitzCryoscopic determinations of its molecular weight show that it is H2O2.
The molecular weight is the sum of the atomic weights of the group.
A Textbook of Assaying: For the Use of Those Connected with Mines. | Cornelius Beringer and John Jacob BeringerAcids like sulphuric acid are termed bibasic, and their equivalent is only half the molecular weight.
A Textbook of Assaying: For the Use of Those Connected with Mines. | Cornelius Beringer and John Jacob Beringer
British Dictionary definitions for molecular weight
the former name for relative molecular mass
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for molecular weight
The sum of the atomic weights of the atoms contained in a molecule. Also called relative molecular mass
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Cultural definitions for molecular weight
[ (muh-lek-yuh-luhr) ]
The sum of the atomic weights of all the atoms in a molecule.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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