1 / 10

Understanding Moles: Avogadro's Number and Mass Calculations in Chemistry

This guide explores the fundamental concepts of moles in chemistry, including Avogadro's Number (6.02 x 10²³), which represents the number of particles in one mole. We dive into calculating the formula mass of compounds, such as carbon dioxide (CO₂), and demonstrate how to convert between moles, grams, and particles. Practical examples include converting grams of lithium into moles and determining the number of atoms from moles. Understanding these relationships is crucial for mastering stoichiometry and chemical calculations.

quemby-warner
Télécharger la présentation

Understanding Moles: Avogadro's Number and Mass Calculations in Chemistry

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Mole

  2. Standards

  3. The Mole 1 dozen = 12 1 gross = 144 1 ream = 500 1 mole = 6.02 x 1023 There are exactly 12 grams of carbon-12 in one mole of carbon-12.

  4. Avogadro’s Number 6.02 x 1023 is called “Avogadro’s Number” in honor of the Italian chemist Amadeo Avogadro (1776-1855). I didn’t discover it. Its just named after me! Amadeo Avogadro

  5. Calculating Formula Mass Calculate the formula mass of carbon dioxide, CO2. 12.01 g + 2(16.00 g) = 44.01 g  One mole of CO2 (6.02 x 1023 molecules) has a mass of 44.01 grams

  6. Atoms or molecules Liters of gas Mole Relationships 22.4 L Avogadro’s number We will re-visit this later in the year 6.02 x 1023 22. 4 L The Mole Gram-molecular mass or molar mass Atomic Mass Grams

  7. Calculations with Moles:Converting moles to grams How many grams of lithium are in 3.50 moles of lithium? 3.50 mol Li 6.9 g Li = g Li 24.2 1 mol Li Convert using the factor-label method Always use “1” mole of ____ in conversion

  8. Calculations with Moles:Converting grams to moles How many moles of lithium are in 18.2 grams of lithium? 18.2 g Li 1 mol Li 2.64 = mol Li 6.9 g Li You can convert from grams to moles again be sure to use “1” mole of ____ in conversion.

  9. Calculations with Moles:Using Avogadro’s Number How many atoms of lithium are in 3.50 moles of lithium? 6.02 x 1023atoms 3.50 mol = atoms 2.07 x 1024 1 mol of Li You can convert from moles to atoms again be sure to use “1” mole of ____ in conversion.

  10. Calculations with Moles:Using Avogadro’s Number How many atoms of lithium are in 18.2 g of lithium? 18.2 g Li 6.02 x 1023 atoms Li 1 mol Li 6.9 g Li 1 mol Li (18.2)(6.022 x 1023)/6.9 1.59 x 1024 = atoms Li You can convert from grams to atoms but you have to convert to moles along the way.

More Related