Chemistry - 4 Chemical Calculations - 4.1 Relative Masses and Moles
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8 Terms
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Relative atomic mass
The weighted mean mass of an atom (including isotopes) of an element compared with 1/12 of the mass of an atom of carbon-12.
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Symbol for relative atomic mass:
Aᵣ
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Relative formula mass
The sum of the relative atomic masses of the elements as given in the formula for any non-molecular compound.
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Symbol for relative formula mass:
Mᵣ
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Avogadro's constant
6.02 × 10²³
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What is one mole of any substance?
the amount of that substance that contains 6.02 x 10²³ particles
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The mass (in g) of one mole of any substance will be the same as...
the substance's relative/formula mass
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number of moles =
Mass in g / Mr
Note 
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