1 / 7

The Mole

The Mole. Q: how long would it take to spend a mole of $1 coins if they were being spent at a rate of 1 billion per second?. Mollionaire. Q: how long would it take to spend a mole of $1 coins if they were being spent at a rate of 1 billion per second? A: $ 6.02 x 10 23 / $1 000 000 000

sibyl
Download Presentation

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. The Mole Q: how long would it take to spend a mole of $1 coins if they were being spent at a rate of 1 billion per second?

  2. Mollionaire Q: how long would it take to spend a mole of $1 coins if they were being spent at a rate of 1 billion per second? A: $ 6.02 x 1023 / $1 000 000 000 = 6.02 x 1014 payments = 6.02 x 1014 seconds 6.02 x 1014 seconds / 60 = 1.003 x 1013 minutes 1.003 x 1013 minutes / 60 = 1.672 x 1011 hours 1.672 x 1011 hours / 24 = 6.968 x 109 days 6.968 x 109 days / 365.25 = 1.908 x 107 years A: It would take 19 million years

  3. The Mole • Atomic Masses give information about # of p+, n0, e– 2. It is useful to associate atomic mass with a mass in grams. 3. It has been found that 1gH,12gC,or 23gNahave6.02x1023atoms 4. 6.02 x 1023 is a “mole” or “Avogadro’s number”

  4. Comparing cobalt & sulfur Co S Mass 58.93 g 32.07 g # of moles? 1 mole of cobalt 1 mole of sulfur • # of atoms? 6.02x1023 6.02x1023

  5. Molar mass • The mass of one mole is called “molar mass” • For ex. 1 mol Lithium = 6.94 g Lithium • This is expressed as 6.94 g/mol • 1 mol Titanium = 47.87 g/mol

  6. Element g/mol g mol Iron 0.25 mol Bromine 53 g Calcium 3.50 mol Arsenic 15 g Converting between grams and moles • In order to convert from one to the other you must first determine the molar mass (g/mol) 55.85 13.96 g 79.90 0.66 mol 40.08 140.3 g 74.92 0.200 mol • Use the “US” set up for each conversion • 0.25 mol Fe = x g Fe • 1 mol Fe = 55.85 g Fe

  7. Element atoms mol Iron 0.25 mol 3.97 x 1023 atoms Bromine Calcium 3.50 mol Arsenic 1.2 x 1023 atoms Atoms? As Avogadro determined… 1 mole = 6.02 x 1023 atoms 1.5 x 1023 atoms 0.66 mol 2.1 x 1024 atoms 0.200 mol • 0.25 mol Fe = x atoms Fe • 1 mol Fe = 6.02 x 1023 atoms Fe

More Related