Download presentation

Presentation is loading. Please wait.

Published byZoe Johnson Modified over 4 years ago

2
The Mole Counting Units Avogadro’s Number Molar Mass How many atoms are there? 6.022 x 10 23

3
Counting Units Counting units – pair, dozen, ream, light year, the mole. Chemistry is quantitative – how many is important. 1 dozen roses = 12 roses 1dozen eggs = 12 eggs 1 ream of paper = 500 sheets Note the number is always the same but the mass can be different

4
Avogadro’s Number What is a mole? A set number to help us count how many atoms are in something There is Avogadro's number of particles in a mole of any substance. Amedeo Avogadro (1776 – 1856) thousands millions billionstrillions quadrillions ? 1 mole = 602213673600000000000000 or 6.022 x 10 23 About 27.7 moles of water in a bottle

5
Just How Big is a Mole? Enough soft drink cans to cover the surface of the earth to a depth of over ________. If you had Avogadro's number of unpopped popcorn kernels, and spread them across the United States of America, the country would be covered in popcorn to a depth of over ______. If we were able to count atoms at the rate of 10 million per second, it would take about _______ years to count the atoms in one mole. 200 miles 9 miles 2 billion

6
= 6.02 x 10 23 M&M’s = 6.02 x 10 23 C atoms = 6.02 x 10 23 H 2 O molecules = 6.02 x 10 23 NaCl “molecules” Note again the number is always the same but the mass can be different A Mole of Particles A Mole of Particles Contains 6.02 x 10 23 particles 1 mole M&M’s 1 mole C 1 mole H 2 O 1 mole NaCl

7
The Mass of 1 mole (in grams) Equal to the numerical value of the average atomic mass (get from periodic table) 1 mole of C atoms= 12.0 g 1 mole of Mg atoms =24.3 g 1 mole of Cu atoms =63.5 g Molar Mass

8
Find the molar mass (usually we round to the tenths place) Learning Check! A.1 mole of Br atoms B.1 mole of Sn atoms =79.9 g/mole = 118.7 g/mole

9
Mass in grams of 1 mole equal numerically to the sum of the atomic masses 1 mole of CaCl 2 = 111.1 g/mol 1 mole Ca x 40.1 g/mol + 2 moles Cl x 35.5 g/mol = 111.1 g/mol CaCl 2 1 mole of N 2 O 4 = 92.0 g/mol Molar Mass of Molecules and Compounds

10
A.Molar Mass of K 2 O = ? Grams/mole B. Molar Mass of antacid Al(OH) 3 = ? Grams/mole Learning Check!

11
Prozac, C 17 H 18 F 3 NO, is a widely used antidepressant that inhibits the uptake of serotonin by the brain. Find its molar mass. Learning Check

Similar presentations

© 2020 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google