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See more. The molecular weight of a particular polymer molecule is a product of the degree of polymerization and the molecular weight of the repeating unit. Learn more. Like the gram atomic weight, in the case of molecules, we describe the weight of one mole (6.022 x 10^23 molecules) as the gram molecular weight. These are defined below. Thus larger the size of molecule more its contribution to the molecular weight average. Also called relative molecular mass . 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). Definition and molecular weight (molar mass) of some common substances . Molecular mass is a number equal to the sum of the atomic masses of the atoms in a molecule. It is based on the fact that bigger molecules contain more mass than smaller molecules. In the SI system the unit of M is [kg/kmol] and in the English system the unit is [lb/lbmol], while in the cgs system the unit of M is [g/mol]. Definition of gram-molecular weight in the Definitions.net dictionary. Molecular definition, of or relating to or caused by molecules: molecular structure. Molecular weight has an important effect on the mechanical properties of polymer, more especially above the glass transition temperature. Weight average molecular weight (M w) measuring system includes the mass of individual chains, which contributes to the overall molecular weight of the polymer. The molecular mass of a molecule is also called the molar mass. Molecular weight is either unitless or expressed in terms of atomic mass units (amu) or Daltons (Da). The mass of one mole of carbon 12 atoms is exactly 12 grams, which is its molar mass is exactly 12 grams per mole. The old symbol was amu, while the most correct symbol is u (a lower-case letter u). Information and translations of gram-molecular weight in the most comprehensive dictionary definitions resource on the web. Define molecular weight ratio. This is because the mass is given per one mole. History. Medical Definition of Molecular weight. Mp is quoted for very narrowly distributed polymers, such as polymer standards used in calibrations. ‘The ethyl group has a greater molecular weight than the smallest alkyl radical which is the methyl group.’ ‘Alcohols and ethers having higher molecular weights do not dissolve well in water, however, because the water molecules can not completely surround those molecules.’ The molecular weight of a polymer is determined by the chemical structure of the monomer units, the lengths of the chains and the extent to which the chains are interconnected to form branched molecules. The key difference between number average and weight average molecular weight is that the number average molecular weight refers to the mole fraction of molecules in a polymer sample whereas the weight average molecular weight is the weight fraction of molecules in a polymer sample.. Gram molecular weight definition is - the mass of one mole of a compound equal in grams to the molecular weight —called also gram-molecule. The molecular weight of a polymer is a way of describing how long the polymer chains are Each monomer has a molecular weight (often called the formula weight) Adding the monomers together to make polymers increases the molecular weight The longer the chains, the higher the molecular weight . A good example is molecular mass or molecular weight. gram-molecular weight, amount of a molecular substance whose weight, in grams, is numerically equal to the molecular weight molecular weight, weight of a molecule of a substance expressed in atomic mass units (amu). Molecular Weight Definition. Sponsored Links . The molecular mass gives the mass of a molecule relative to that of the 12 C atom, which is taken to have a mass of 12. They are physical properties of substances and are very useful in … The molecular weight of a substance, also called the molar mass, M, is the mass of 1 mole of that substance, given in M gram. Often, the terms are called weight rather than mass and used interchangeably. Molecular weight is commonly abbreviated by M.W. The mass of one mole of carbon 12 atoms is exactly 12 grams, which is its molar mass is exactly 12 grams per mole. Definition of Molecular weight. Unlike pure compounds, polymers form as a mixture of different molecules (pure compounds contain … ‘The ethyl group has a greater molecular weight than the smallest alkyl radical which is the methyl group.’ ‘Alcohols and ethers having higher molecular weights do not dissolve well in water, however, because the water molecules can not completely surround those molecules.’ molecular weight ratio synonyms, molecular weight ratio pronunciation, molecular weight ratio translation, English dictionary definition of molecular weight ratio. Atomic weight is a common name for relative atomic mass, which is defined as the ratio of the average mass of one atom of an element to 1 12 \frac{1}{12} 1 2 1 of the mass of an atom of carbon-12. Two experimentally determined values are common: $$M_n$$, the number average molecular weight, is calculated from the mole fraction distribution of different sized molecules in a sample, and $$M_w$$, the weight average molecular weight, is calculated from the weight fraction distribution of different sized molecules. Noun. Molar Mass: Molecular Weight: Definition: It is the mass of a mole of a particular substance: It is the mass of a molecule: Unit: Kgmol-1: Atomic mass units: Calculation: It is calculated by dividing the mass of a substance by the amount of the substance: It is calculated as the mass of substance relative to the 1/12 th of the mass of the carbon-12 atom. Formula Mass: Formula mass is the sum of the masses of atoms present in the empirical formula. The unified mass unit is related to the molar mass constant (M … Protein molecular weight markers, sometimes identified as protein standards or protein ladders, are used to estimate the molecular weight of proteins of interest, to monitor the progress of electrophoretic separation or transfer, and as a positive control for analysis conditions. 1. The definition of molecular weight is directly related to the carbon-12 isotope. 1. Molecular Weight A molecular weight is simply the weight of one mole (6.022x10^23 molecules) of a compound. 2.4.2 Weight Average Molecular Weight. Effect of Molecular Weight 10 For example, let’s look at hydrocarbons Very short chain … Molecular weight is used in chemistry to determine stoichiometry in chemical reactions and equations. Although the definition and units are different for molar mass and molecular weight, the value is the same. The polymers produced in polymerization … Molecular Mass Definition . Definition of molar mass averages. Molecular Mass Definition. If the average atomic mass (m a) or average molecular mass is known, we can convert it into the molar mass (M) with the help of the molar mass constant (M u). molecular weight meaning: 1. another term for relative molecular mass specialized 2. another term for relative molecular mass…. or MW. The highest molecular weight polymers are obtained under strictly controlled stoichiometric conditions, that is to say, an exact 1:1 molar ratio of two functional groups is necessary according to the classical theory of polycondensation. The weight in atomic mass units of each of the atoms in a given formula is the molecular weight of a substance. Difference Between Formula Mass and Molecular Mass Definition. The molecular mass gives the mass of a molecule relative to that of the 12 C atom, which is taken to have a mass of 12. In practice four averages are used, representing the weighted mean taken with the mole fraction, the weight fraction, and two other functions which can be related to measured quantities: . Search molecular weight and thousands of other words in English definition and synonym dictionary from Reverso. A molecular weight marker is a molecule used to provide an estimate of the size of molecules subjected to gel electrophoresis.This is a technique in which DNA, RNA, or proteins are separated by size, using an electrical current on a gel.This term should not be confused with molecular markers in genetics — areas in which an organism’s DNA differs from the rest of the population and … What does gram-molecular weight mean? n. The sum of the atomic weights of all the atoms in a molecule. Because virtually all polymers are mixtures of many large molecules, we have to resort to averages to describe polymer molecular weight. Meaning of gram-molecular weight. (chemistry) the sum of the atomic weights of every atom in a molecule ¹ . The average atomic mass is measured in the unified mass unit (u). The definition of molecular weight is most authoritatively synonymous with molecular mass; however, in common practice, it is also highly variable as are the units used in conjunction with it. Different average values can be defined, depending on the statistical method applied. molecular weight to be calculated, the peak molecular weight Mp, defined as: Mp = molecular weight of the highest peak Therefore, Mp is the mode of the molecular weight distribution. Definition; History; Inside the atom; Atomic number; Atomic mass; Notation; Molecular weight; Definition. relative molecular mass n the sum of all the relative atomic masses of the atoms in a molecule; the ratio of the average mass per molecule of a specified isotopic composition of a substance to one-twelfth the mass of an atom of carbon-12., (Symbol) Mr (Abbrev) r.m.m (Former name) molecular weight Definition of average molecular weight c. z average molecular weight ( MZ ) M Z= NiMi (ultracentrifugation) 2 d. general equation of average molecular weight : M = ( a=0 , Mn … An atomic mass unit is described as 1/12 th the weight of the carbon-12 isotope. For instance a particular polythylene molecule with $$DP = 1000$$ will have a molecular weight of 28,000. Since larger molecules in a sample … Molecular weight definition: the relative average weight of a molecule of a substance , expressed by a number equal to... | Meaning, pronunciation, translations and examples Molecular mass is a number equal to the sum of the atomic masses of the atoms in a molecule. Definition of average molecular weight a. number average molecular weight ( Mn ) Mn= i i Ni (colligative property and end group analysis) b. weight average molecular weight ( Mw) Mw= WiMi (light scattering) N M Wi 7. Molecular weight is a measure of the sum of the atomic weight values of the atoms in a molecule. The main difference between molar mass and molecular weight is that molar mass gives the mass of a mole of a particular substance whereas molecular weight is the mass of a molecule of a particular substance. ¹ Source: wiktionary.com. Synonyms, molecular weight ratio units of each of the sum of the of... 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