Avogadro's constant, number of moles, number of particles

In summary: You would say "twelve dozens" not "one dozen".In summary, Nitrogen has a molar mass of 28 grams and can be found in 28 grams of a substance.
  • #1
negation
818
0
Dealing with these has reminded me why I hated chemistry.

What is the relationship between the above 3? Given atomic weight of nitrogen and Avogadro's constant, can the number of moles be found?
 
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  • #3
negation said:
Given atomic weight of nitrogen and Avogadro's constant, can the number of moles be found?

You don't need Avogadro's constant there.
1 mole = Atomic mass of Nitrogen

You should never call that atomic weight. It's atomic mass.
 
  • #4
negation said:
Given atomic weight of nitrogen and Avogadro's constant, can the number of moles be found?

Number of moles of what?
 
  • #5
adjacent said:
You don't need Avogadro's constant there.
1 mole = Atomic mass of Nitrogen

You should never call that atomic weight. It's atomic mass.
That's new. My physics assignment called that atomic weight which throws in further confusion.

1 mole = 1 atomic mass of Nitrogen?
 
  • #6
Borek said:
Number of moles of what?

Nitrogen. Given Avogadro's constant and the atomic mass of Nitrogen being 28g/mol, is it possible to determine the number of moles?
 
  • #7
negation said:
That's new. My physics assignment called that atomic weight which throws in further confusion.

negation said:
1 mole = 1 atomic mass of Nitrogen?
Oh sorry it should be --> not =

1 mole of Nitrogen --> atomic mass of nitrogen.

So 1 mol --> 28
x -->28
Cross multiply. You get 1 mole again.
Didn't you study that?

1 mole of any element --> atomic mass of that element.I leave all these to Borek. He knows better.
 
  • #8
negation said:
Nitrogen. Given Avogadro's constant and the atomic mass of Nitrogen being 28g/mol, is it possible to determine the number of moles?

Number of moles of nitrogen in what?
 
  • #9
Borek said:
Number of moles of nitrogen in what?


In 28g?
 
  • #10
Yes. This is trivial - 28 g is a molar mass of N2. If you have 28 g of a substance that has molar mass of 28 g/mol, how many moles do you have?

It is like asking "how many dozens in twelve?".
 

1. What is Avogadro's constant?

Avogadro's constant, denoted as NA, is a fundamental physical constant that represents the number of particles in one mole of a substance. It is approximately equal to 6.022 x 1023 particles per mole.

2. How is Avogadro's constant related to the number of moles?

Avogadro's constant is used to define the number of particles in one mole of a substance. This means that for every mole of a substance, there are exactly NA particles present.

3. What is the difference between number of moles and number of particles?

The number of moles, represented by the symbol n, is a unit of measurement used to express the amount of a substance. It is equal to the mass of the substance divided by its molar mass. On the other hand, the number of particles refers to the actual number of atoms, molecules, or ions present in a given substance.

4. How is Avogadro's constant used in calculations?

Avogadro's constant is used in various calculations involving the conversion between moles and particles. For example, to convert from moles to particles, you would multiply the number of moles by Avogadro's constant. To convert from particles to moles, you would divide the number of particles by Avogadro's constant.

5. Why is Avogadro's constant important in chemistry?

Avogadro's constant is important in chemistry because it allows us to connect the macroscopic world (mass, volume) to the microscopic world (particles). It also helps us to accurately measure and understand the amount of substances present in a reaction, and to make precise calculations and predictions in chemistry.

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