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what is the definition of formula weight in chemistry. The conventional definition of weight is actually mass which is the amount of matter something contains. So we can calculate the molar mass of any compound in the same way we calculate the atomic weight from its constituent elements.
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Of an ionic compound that does not form molecules the sum of the atomic weights of the atoms of the formula unit. Formula weight in chemistry a quantity computed by multiplying the atomic weight in atomic mass units of each element in a formula by the number of atoms of that element present in the formula and then adding all of these products together. The relative formula mass of a substance made up of molecules is the sum of the relative atomic masses of the atoms in the numbers shown in the formula.
In practice C exists as an amorphous mass rather than individual molecules of C or C2 or whatever.
If I dissolve 10 g of fat in 90 g ethanol so the total mass of the whole solution is 100 g then I have made a. Molecular weight 6 x 1201 14 x 101 molecular weight of hexane 7206 1414. Used where the weight of each chemical is used and not the volume eg. Relative formula mass has the symbol Mr.
