1 / 11

The Mole

Conversions involving molar mass and Avogadro’s number. The Mole. The Mole. A unit of measurement for counting atoms or molecules 1 Mole = 602 billion trillion 602,000,000,000,000,000,000,000 6.02 X 10 23 (this is known as Avogadro’s number). Amadeo Avogadro.

jeremycook
Télécharger la présentation

The Mole

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. Conversions involving molar mass and Avogadro’s number The Mole

  2. The Mole • A unit of measurement for counting atoms or molecules • 1 Mole= 602 billion trillion • 602,000,000,000,000,000,000,000 • 6.02 X 1023 (this is known as Avogadro’s number)

  3. Amadeo Avogadro • Avogradro’s number is named in honor of Amedeo Avogadro (1776 – 1856) • He studied quantities of gases and discovered that no matter what the gas was, there were the same number of molecules present

  4. What can the mole be used for? • We can count anything using the mole • Example: • 1 mole of M & M’s would stretch from here to the sun and back 200 billion times • * assuming m&m’s are 1 cm in diameter and the distance to the sun is 93 million miles • Can you swim in1 mole of water? • 1 mole of H2O= about 1/3 of a cup (18 mL)

  5. So, why use the mole? • It is helpful in counting a large number of items • If the items are extremely small

  6. A Mole of Particles= 6.02 x 1023 particles A mole of particles = 6.02 x 1023C atoms =6.02 x 1023H2O molecules = 6.02 x 1023NaCl formula unit 1 mole C 1 mole H2O 1 mole NaCl

  7. Conversion Factors * 1 mole = 6.02 x 1023particles Note: Particles could refer to atoms, molecules, formula units * 1 mole = molar mass (g) of compound being used

  8. Conversions: • MUST use dimensional analysis • MUST use the molar mass if grams are used in the problem • Be able to convert from • Moles to atoms or molecules • Moles to grams • Grams to moles

  9. Example 1: • How many atoms are in 0.500 mole of Al? • Setup your problem using dimensional analysis: • * Multiply across and divide by the number at the bottom 6.02 x 10 23 atoms Al 0.500 mol Al = 3.01 x 10 23atoms Al 1 mol Al

  10. Example 2: • How many moles of Sulfur (S) are in 1.8 x 10 24atoms of sulfur ? • (Use dimensional analysis) • * Multiply across and divide by the number at the bottom 1.8 x 10 24atoms S 1 molS = 2.99 mol S 6.02 x 10 23atoms S

  11. Practice Problems • 1.) How many moles are in 5.22 x 10 24 atoms of H2O? • 2.) How many molecules of NaOH are in 23 moles of NaOH?

More Related