4.3 Quantitative Chemistry

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9 Terms

1
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Relative atomic mass (Ar)

(mass number of isotope 1 X percentage abundance of isotope 1) + (mass number of isotope 2 X percentage abundance of isotope 2) all / 100 or total mass of atoms / total number of atoms

2
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Relative formula mass (Mr)

Sum of all Relative atomic masses

3
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Percentage by mass

(mass of element / Mr) X 100

4
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Conservation of mass

Mass of reactants = mass of products

5
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Moles

Mass / Mr

6
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Percentage yield

(actual mass / theoretical mass) X 100

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Atom economy

Mr of useful product / Mr of all reactants

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Concentration

(g/dm³) = mass (g) / volume (dm³) or (mol/dm³) = moles / volume (dm³)V

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Volumes of gases

Volume (dm³) = moles X 24