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Answered 2008-09-13 07:07:25

Technically... not really. It would perhaps be more accurate to use the terms formula mass and molecular mass rather than formula weight and molecular weight. This because in physical terms, weight is a force while mass is a measure of the amount of substance in something.

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No. Molecular weight is the "weight" of one molecule, Mass is the total "weight" of an object.


Molecular weight is just an older term for molar mass. They are the same.


I'm not exactly positive. But if you know the volume in grams and the mass (giving you density), then you should be able to figure out the molecular weight. The mass is the same as the molar mass, which I would assume is the same as the molecular weight, but I'm not positive.


The same as the molecular weight of the compound.


The molecular mass or weight is 149.233 g/mol


86.18 g/mol, from Wikipedia http://en.wikipedia.org/wiki/Hexane Btw, The molecular molecular weight of a compound is the same thing as molar mass. Wikipedia has molecular weight for almost every compound in the bar/table on the right side of the webpage for the compound, next the label "molar mass". 86.18 g/mol, from Wikipedia http://en.wikipedia.org/wiki/Hexane Btw, The molecular molecular weight of a compound is the same thing as molar mass. Wikipedia has molecular weight for almost every compound in the bar/table on the right side of the webpage for the compound, next the label "molar mass".


The units for molecular weight are AMU's. The units for molecular mass are g/mol's.


the relative molecular mass or molecular weight of a compound is the mass of a molecule of the compound relative to the mass of a carbon atom taken as exactly 12.


molecular mass is same as atomic mass


The only difference is the name of the unit; the numerical values are the same. However, the value in amu is the mass of a single molecule, while the molecular weight in grams is the mass of Avogadro's number of molecules. The mass of Avogadro's number of molecules is called a Gram-mole. The molecular weight of , say, Hydrogen H2 is 2 amu. A gram mole of this would be 2 grams. The molecular weight in grams is the weight of this molecule in real grams and is an extremely small value.


The molecular mass of Na3PO4 is 163.94 u.


The molecular weight (mass) means the mass of one molecule only so for H2O it is 18 a.m.u for 7H2O it will be total mass 126.


MgCO3 has a molar mass (molecular weight) of 84.3139 g/mol.


The formula weight for O3 is the same as the molecular weight which is taking all the elements, multiplying its mass, and then adding the products. Oxygen's mass is 16 g on the periodic table & there's three of them so: 16x3= 48 g (molecular weight) = This is your Formula weight. Hope that helped.


You haven't stated the compound or molecular weight. The formula you need is the number of moles = mass / molecular mass. If you have millimoles, multiplying by molecular weight will convert to milligrams.


The molecular weight of water is 18g/mol. If you have the mass (in grams!), you divide by the molecular weight. This gives you the amount of moles.


Sodium nitrate molecular weight is 84,9947.


no. moles = mass / molecular weight molecular weight = 64.06 mass = 28.4 28.4 / 64.06 = .4433moles sulphur


The formula is number of moles = mass / molecular weight. Therefore, you have to multiply moles by molecular weight. The molecular weight can be found from the periodic table.


The formula for sodium acetate is CH3COONa and the equivalent weight is the same as the molecular weight (molar mass) which is 82.0343 g/mol.


The a.m.u. is defined as the fraction of 1/12 of an atom of the carbon-12 isotope. The value is pretty nearer to the mass of a hydrogen atom. Therefore, in every compound, the gram molecular weight is numerically equal to the molecular mass in atomic mass units. Therefore the gram molecular weight of NaOH is 40 g/mol.


The atomic mass (not molecular weight) of technetium-99 is 98,906 254 7(21).


The formula is Ag3PO4.See the Related Questions link to the left to solve for the molar mass (same as molecular weight).


The atomic (molecular) weight of a substance is its molar mass.


The specific heat capacity of different substances is different because substances do not have the same molecular mass. Molecular mass is the total weight of the atoms or molecules of a substance.



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