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HomeHomework HelpchemistryAtomic Mass and Composition

Atomic Mass and Composition

Atomic mass refers to the mass of an individual atom, typically expressed in atomic mass units (amu), while molecular composition describes the types and quantities of atoms within a molecule.

intermediate
3 hours
Chemistry
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Overview

Atomic mass and molecular composition are fundamental concepts in chemistry that help us understand the properties and behaviors of elements and compounds. Atomic mass is determined by the weighted average of an element's isotopes, which can vary in number of neutrons. This understanding is crucial ...

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Key Terms

Atomic Mass
The average mass of an element's isotopes, measured in atomic mass units (amu).

Example: Carbon has an atomic mass of about 12.01 amu.

Isotope
Atoms of the same element with different numbers of neutrons.

Example: Carbon-12 and Carbon-14 are isotopes of carbon.

Molecular Formula
A formula that shows the types and numbers of atoms in a molecule.

Example: The molecular formula of water is H₂O.

Molar Mass
The mass of one mole of a substance, usually expressed in grams per mole (g/mol).

Example: The molar mass of water is approximately 18 g/mol.

Stoichiometry
The calculation of reactants and products in chemical reactions.

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

Element
A pure substance made of only one type of atom.

Example: Oxygen (O) is an element.

Related Topics

Chemical Reactions
Study of how substances interact and transform into new substances.
intermediate
Periodic Trends
Understanding how atomic structure affects element properties.
intermediate
Thermochemistry
Exploration of heat changes in chemical reactions.
advanced

Key Concepts

Atomic MassMolecular FormulaIsotopesMolar Mass