Mole Conversions

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Mole (mol) Noun

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[mohl]

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Mole (mol)

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The SI base unit used to measure the amount of a substance, defined as containing exactly 6.022 x 10^23 elementary entities.

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Example: This image shows that one mole of any substance (like carbon or copper) always contains the same number of atoms (6.02 x 10^23), but has a different mass.

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Avogadro's Number Noun

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[ah-vuh-gah-drohz nuhm-ber]

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Avogadro's Number

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The number of representative particles in one mole of a substance, which is approximately 6.022 x 10^23 particles per mole.

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Example: This image shows Avogadro's number, which is the specific quantity (6.02 x 10^23) of atoms or molecules found in one mole of a substance.

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Representative Particles Noun

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[rep-ri-zen-tuh-tiv pahr-ti-kuhls]

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Representative Particles

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The smallest unit in which a substance naturally exists, typically an atom, ion, or molecule, used for chemical calculations.

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Example: This image shows a single water molecule, which is the representative particle for the compound water, illustrating the smallest unit counted in mole conversions.

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Molar Mass Noun

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[moh-ler mas]

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Molar Mass

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The mass of one mole of a chemical substance, expressed in units of grams per mole (g/mol).

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Example: This image shows how to find the molar mass of a water molecule (H₂O) by adding the individual atomic masses of its atoms: two hydrogen and one oxygen.

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Standard Temperature and Pressure (STP) Noun

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[stan-derd tem-per-uh-cher and presh-er]

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Standard Temperature and Pressure (STP)

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A set of standard conditions for experimental measurements, established as 0°C (273.15 K) and 1 atm of pressure.

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Example: This image defines Standard Temperature and Pressure (STP) as 0°C and 1 atm, and shows that at these conditions, one mole of any gas occupies 22.4 liters.

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Molar Volume Noun

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[moh-ler vol-yoom]

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Molar Volume

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The volume occupied by one mole of any ideal gas at standard temperature and pressure (STP), which is 22.4 liters.

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Example: This diagram shows that one mole of different gases (Helium, Nitrogen, Methane) takes up the same amount of space (22.4 L) at the same temperature and pressure.

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Stoichiometry Noun

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[stoy-kee-om-i-tree]

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Stoichiometry

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The calculation of relative quantities of reactants and products in chemical reactions based on balanced chemical equations.

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Example: This image shows a balanced chemical reaction where atoms from reactants (methane and oxygen) rearrange to form products (carbon dioxide and water) in fixed ratios.

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Mole Ratio Noun

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[mohl rey-shee-oh]

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Mole Ratio

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A conversion factor derived from the coefficients of a balanced chemical equation, used to relate moles of different substances.

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Example: This diagram shows a balanced chemical reaction, where the number of molecules (e.g., 2 Oxygen) visually represents the mole ratio used in calculations.