Chem Mole: Molecules to Atoms?

[kasakato]

Homework Statement

What is the total number of atoms in the molecules?
NH3 - 2.5 mole

Homework Equations

Would you multiply the number of atoms in NH3 by Avogadro constant to find the number of atoms?
(4 atoms)(6.02*10^23)
=answer

Or would you multiply the number of moles by Avogadro constant, and then multiply that by the number of atoms?
(2.5 moles)(6.02*10^23)
=x- number of molecules in 2.5mole of NH3

(x)(4 atoms)
=answer

 

[symbolipoint]

Almost. Set Up the calculation according to your known units. 1 mole of ammonia is composed of 4 atoms. You have how many moles of given ammonia?

2.5 moles ammonia * (4 moles of atoms per mole of ammonia) * (AvogNumber... I will not finish this, but you should try to finish it.

 

[kasakato]

Excellent, thank you.

Just to simplify things, as a skeleton formula, it would look like:

Total atoms = (total moles)(number of atoms in formula)(Avg con)

In the case of the original question:
Total atoms=(2.5)(4)(6.02x10^23)
Total atoms= 6.02x10^24

 

[Borek]

Total atoms= 6.02x10^24

Correct.

 

[kasakato]

Correct.

Thanks. :) I finished off the rest of my questions without a hitch.

 

[symbolipoint]

I made an error in post #2, saying:

1 mole of ammonia is composed of 4 atoms.

One mole of ammonia molecules contains FOUR moles of ATOMS.