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Posted: Tue Oct 01, 2019 5:02 pm
I was wondering in what situations do we use Avogadro's number? I am just a bit confused on what it is used for and how to use it after it was used in a practice problem (E-11) in my discussion today.

Posted: Tue Oct 01, 2019 5:05 pm
As far as I know, Avogrado's Number is most commonly used to find the amount of molecules/atoms in a mol of a substance. By it's formal definition, the constant itself is the number of units in one mol of any substance where the units may be electrons, ions, atoms, or molecules. If you did practice problems in Fundamentals section A or B, the constant can be used in many varying context but is most commonly used to find the amount of atoms or molecules in chemistry at least.

Posted: Tue Oct 01, 2019 5:15 pm
You use Avogadro's number when you are trying to find the number of particles, atoms, or formula units of a substance.

Posted: Tue Oct 01, 2019 6:24 pm
A good example of when to use avogadro's number can be seen in example E.1 in the textbook. The number of hydrogen atoms is given in a sample, 1.29 X 10^24 H atoms. The questions wants to know how many moles of hydrogen atoms can be stored in a hydrogen storage device. Avogadro's number comes into play when the number of hydrogen atoms is divided by the constant, because 1 mole has 6.0221 X 10^23 of something, and in this case it is atoms. The final answer is then given in moles, 2.14 mol H.

Posted: Tue Oct 01, 2019 6:39 pm
Avogadro’s number is just a quantity of something. You would typically use it to determine how many atoms are there in a compound or such like that. Since 1 mole is equal to 6.022 x10^23, you can use the number of moles you have to determine how many atoms are in that substance

Posted: Tue Oct 01, 2019 8:03 pm
Avogadro's number is used to describe a quantity of something. It is similar to the concept of a "dozen" except instead of referring to 12 of something, it refers to 6.022*10^23 of something. It is used when converting to/from moles to/from a number of molecules, formula units or atoms, among other things.

Posted: Tue Oct 01, 2019 8:44 pm
Think of 6.022x10^23 as the amount of "things" in a mole. If you have 6.022x10^23 cats you have a mole of cats. If you have 6.022x10^23 voles (a gopher-like animal) , you have a mole of voles. So, if they ask how many molecules of let's say CO2 in 4 moles, multiply 4 by 6.022x10^23, and there you go.

Posted: Tue Oct 01, 2019 9:16 pm
Avogadro's number is 6.0221 x 10^23. It is used to find the number of atoms, molecules, or ions in a mole of any substance.

Posted: Tue Oct 01, 2019 9:23 pm
Avogadro's number, 6.0221 x 10^23, is used in order to calculate the amount of particles within a certain mass of a substance.

Posted: Tue Oct 01, 2019 11:01 pm
When you want to convert from moles to atoms, you multiply the molar amount by Avogadro’s number.
When you want to convert from atoms to moles, divide the atom amount by Avogadro’s number.