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

1. May 7, 2014

### negation

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?

Last edited: May 7, 2014
2. May 7, 2014

3. May 7, 2014

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. May 7, 2014

### Staff: Mentor

Number of moles of what?

5. May 7, 2014

### negation

That's new. My physic assignment called that atomic weight which throws in further confusion.

1 mole = 1 atomic mass of Nitrogen?

6. May 7, 2014

### negation

Nitrogen. Given Avogadro's constant and the atomic mass of Nitrogen being 28g/mol, is it possible to determine the number of moles?

7. May 7, 2014

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. May 7, 2014

### Staff: Mentor

Number of moles of nitrogen in what?

9. May 7, 2014

### negation

In 28g?

10. May 7, 2014

### Staff: Mentor

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?".