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Understanding the Concept of a Mole and Avogadro's Number, Study notes of Chemistry

University of Florida (UF)Chemistry

The concept of a mole, which is a counting unit in chemistry, and Avogadro's Number (6.02 x 1023). It discusses how the number of particles in a mole is always the same, but the mass varies greatly depending on whether the particles are atoms, molecules, or ions. The document also covers how to calculate the number of atoms or grams of a substance.

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2021/2022

Uploaded on 09/27/2022

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Partial preview of the text

Download Understanding the Concept of a Mole and Avogadro's Number and more Study notes Chemistry in PDF only on Docsity! The Mole • A counting unit • 6.02 X 1023(in scientific notation) • This number is named in honor of Amedeo Avogadro (1776 – 1856) 1 dozen cookies = 12 cookies 100 cookies = 102 cookies A million of cookies = 106 cookies 1 mole of cookies = 6.02 X 1023 cookies 1 mole C = 6.02 x 1023 C atoms 1 mole H2O = 6.02 x 1023 H2O molecules 1 mole NaCl = 6.02 x 1023 NaCl molecules (6.02 x 1023 Na+ ions and 6.02 x 1023 Cl– ions) A Mole of Particles Contain 6.02 x 1023 particles 1 mole = 6.02 x 1023 particles A particle could be an atom, a molecule, OR an ion! Note that the NUMBER is always the same, but the MASS is very different! Atoms/Molecules and Grams Ex: How many atoms of Cu are present in 35.4 g of Cu? 63.5g Cu = 1mol Cu 35.4g Cu = 0.56mol Cu 1mol Cu = 6.02X 1023 mol Cu atoms 0.56 mol Cu = 3.4 X 1023 Cu atoms Test your skills • How many atoms are in 36 grams of C?

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