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HomeHomework HelpchemistryMoles and Molar Mass

Moles and Molar Mass

The mole is a fundamental unit in chemistry that measures the amount of substance, defined as containing exactly 6.022 x 10²³ representative particles, such as atoms or molecules. Molar mass, the mass of one mole of a substance, is expressed in grams per mole and is critical for converting between moles and grams.

beginner
2 hours
Chemistry
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Overview

Moles and molar mass are fundamental concepts in chemistry that help us quantify substances. A mole allows chemists to count particles by weighing them, while molar mass provides a way to convert between mass and amount of substance. Understanding these concepts is crucial for performing calculation...

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Key Terms

Mole
A unit that measures the amount of substance.

Example: One mole of water contains 6.022 x 10²³ water molecules.

Molar Mass
The mass of one mole of a substance, expressed in grams per mole.

Example: The molar mass of carbon dioxide (CO₂) is about 44 g/mol.

Avogadro's Number
The number of particles in one mole, approximately 6.022 x 10²³.

Example: One mole of any substance contains Avogadro's number of particles.

Stoichiometry
The calculation of reactants and products in chemical reactions.

Example: Stoichiometry helps determine how much product can be made from given reactants.

Atomic Mass
The mass of an atom, typically measured in atomic mass units (amu).

Example: The atomic mass of hydrogen is about 1.01 amu.

Balanced Equation
An equation that has the same number of each type of atom on both sides.

Example: 2H₂ + O₂ → 2H₂O is a balanced equation for water formation.

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Key Concepts

Mole conceptMolar mass calculationAvogadro's numberStoichiometry