Finding moles of O from 4.5×10²⁰ SnO₂ molecules

[Attraction]

Homework Statement

If you have 4.5 x 10²⁰ molecules of SnO₂, how many moles of O do you have?

The Attempt at a Solution

I'm really getting the hang of moles lately but what is bothering me in this question is 4.5 x 10²⁰ molecules of SnO₂.

If it was one molecule, you would have 2 moles of O yes?
Therefore in 4.5 x 10²⁰ molecules, you have 4.5 x 10²⁰ multiplied by 2? But that doesn't give me the correct answer.

 

[symbolipoint]

Simple unit conversion and seeing the ratio of items. You need to know the meaning of a mole.

 

[Attraction]

Simple unit conversion and seeing the ratio of items. You need to know the meaning of a mole.

Would I be right in saying that there would be 2 mols of O in ONE molecule of SnO2? I think so. So that would be 2 x Avogadros #.

Therefore in 4.5 x 1020 molecules of SnO2, there should be 2 mols of O x 4.5 x 1020 molecules? I know that's not right though. Where am I going wrong.

 

[Borek]

Would I be right in saying that there would be 2 mols of O in ONE molecule of SnO2?

No. There will be two ATOMS of oxygen in one molecule on SnO₂.

How many atoms per mole?

 

[Attraction]

No. There will be two ATOMS of oxygen in one molecule on SnO₂.

How many atoms per mole?

6.022x10²³ per mole yes?, my problem is figuring out how many mols of O are in 1 molecule of SnO₂.

So I must be wrong there with Avogadros number then?

 

[Borek]

Yes.

 

[Attraction]

I figured it out. Pretty easy. There is 2 atoms of O in the molecule. Therefore there is 2 x 4.5 x 10²⁰ atoms in 4.5 x 10²⁰ molecules... simple.

Then convert atoms into moles by dividing by avogadros #.

thanks.

 

[symbolipoint]

Finally, Yes.