S1.4 SL - Counting particles by mass: The mole

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Chemistry

IB Chemistry (SL)

Last updated 1:09 PM on 9/2/26
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9 Terms

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Avogadro's constant, Na

State the number of particles in 1 mole of a substance.

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Relative atomic mass

Ar. The mass of an atom compared to 1/12 of an atom of carbon-12.

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Relative formula mass

Mr. The mass of an molecule compared to 1/12 of an atom of carbon-12.

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Molar mass

M. The mass of 1 mole of a substance.

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Empirical formula

The simplest whole number ratio of elements in a compound.

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Molecular formula

States the number of each atom present in a molecule.

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Concentration

The amount or mass of a substance per unit volume.

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Standard solution

A solution with accurately and precisely known concentration.

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Avogadro's law

States that at constant temperature and pressure, the volume of any gas is proportional to the number of moles.