Page 1 of 1

Posted: Tue Jul 04, 2017 3:17 pm
As I was working on some of the practice problems in the textbook, Avogadro number came out and I am not sure if we will need it for this upcoming test, if so can someone please explain its concept because it confused me.

Posted: Tue Jul 04, 2017 6:06 pm
Avogadro's number is 6.022 x 10^23. It represents the number of molecules in one mole of that substance. You usually use this value for the problems in the fundamental chapters of the book. Whenever you need to convert from grams to moles to molecules to atoms, this value is needed as a conversion factor.

Posted: Mon Oct 02, 2017 3:09 pm
The Avogadro's number is 6.022 x 10^23 and this number is what defines 1 mole. A "Mole" is similar to the use of "dozen" (12) or "gross" (144). All of these numbers are used to group a certain amount of stuff (such as electrons, atoms, molecules,etc).

** I'd like to note that the Avogadro's number is slightly different than Avogradro's constant in terms of units. Avogadro's number has no units, whereas Avogadro's constant is 6.022 x 10^23 mol^-1!

Posted: Mon Oct 02, 2017 11:36 pm
Dr. Lavelle mentioned in class today that we will be given a periodic table, list of equations, and list of constants for every test. Avogadro's number should be listed on this list of constants so you do not need to worry about memorizing it. However, you should be familiar with how to use it since it is so common in chemistry. Avogadro's number, 6.022*10^23, indicates the number of atoms or molecules in one mole of substance. Therefore, using dimensional analysis, you can convert between number of atoms, moles, and molar mass of a substance.