Composition of Substances and Solutions
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Last updated 2:37 PM on 8/16/22
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13 Terms
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Formula mass
sum of the atomic masses of the atoms in the chemical formula
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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
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avogadro's number
6.022 x 10^23
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Percentage composition
percentage, by mass, contributed by each element
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Empirical formulas:
give relative number of atoms of each element in a substance
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Molecular formulas
give actual number of atoms in a substance
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Solution:
a homogeneous mixture of two or more substances
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Solvent:
the substance present in greatest quantity
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Solutes:
dissolved in the solvent
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Molarity (M) =
(moles of solute) / (volume of solution in liters)
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ppm =
mass of solute/mass of solution x 10^6
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ppb =
mass of solute/mass of solution x 10^9
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1 ppm =
1000 ppb
Flashcards (47)