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Formula mass
sum of the atomic masses of the atoms in the chemical formula
One mole
the amount of substance that contains as many atoms, molecules, or other objects, as the number of atoms in 12 grams of isotopically-pure 12C
avogadro's number
6.022 x 10^23
Percentage composition
percentage, by mass, contributed by each element
Empirical formulas:
give relative number of atoms of each element in a substance
Molecular formulas
give actual number of atoms in a substance
Solution:
a homogeneous mixture of two or more substances
Solvent:
the substance present in greatest quantity
Solutes:
dissolved in the solvent
Molarity (M) =
(moles of solute) / (volume of solution in liters)
ppm =
mass of solute/mass of solution x 10^6
ppb =
mass of solute/mass of solution x 10^9
1 ppm =
1000 ppb
Note 
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