Sarah Blake-2I
Posts: 153
Joined: Fri Aug 30, 2019 12:16 am

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.

Vincent Leong 2B
Posts: 207
Joined: Fri Aug 09, 2019 12:15 am

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.

LNgo 1G
Posts: 100
Joined: Sat Aug 24, 2019 12:16 am

You use Avogadro's number when you are trying to find the number of particles, atoms, or formula units of a substance.

Aayush Patel 3B
Posts: 51
Joined: Thu Jul 25, 2019 12:17 am

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.

Minh Ngo 4G
Posts: 137
Joined: Thu Jul 25, 2019 12:17 am

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

Posts: 100
Joined: Sat Aug 17, 2019 12:15 am

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.

Posts: 125
Joined: Sat Aug 17, 2019 12:17 am

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.

Daniel Martinez 1k
Posts: 50
Joined: Wed Sep 18, 2019 12:16 am

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.

emma brinton_3B
Posts: 53
Joined: Fri Aug 09, 2019 12:17 am

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.

Megan Ngai- 3B
Posts: 50
Joined: Fri Aug 09, 2019 12:17 am

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.

Patricia Chan 1C
Posts: 50
Joined: Sat Jul 20, 2019 12:16 am

You want to use Avogadro's Number in order to convert mols into atoms, molecules, or formula units. If the question wants you to do this, it will specify that they are looking for such units (atoms, molecules, formula units etc).

605379296
Posts: 58
Joined: Sat Aug 17, 2019 12:16 am

You use Avogadro’s number when you want to covert moles into atoms. For example, when you’re given a certain number of grams, like 500 grams of NaCl, you would divide this number by the molar mass of NaCl. Then, you take the number of moles in NaCl and multiply by Avogadro’s number to get the number of atoms present.

Joanne Lee 1J
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Joined: Thu Jul 25, 2019 12:15 am