[chrisbb]

HI ALL!
So I'm tutoring chemistry to a few high school people. One of them is in grade 11, and is very good at chem.
I've graduated college, now in uni to get my degree....

I'm having trouble explaining to her limiting reagent. Now she understands stoich. reactions.
Here is what I'm stuck on;




- Now I understand how to find the mols
- As I understood it;



(you take the lowest #mol, and then use that value to find the amount you're looking for)
The answers are:

- O₂ is the LR
- H₂O is 21.4g

Can someone please shed some light on this.
I understand that I'm missing something, just don't know what.

Thanks so much.

[Borek]

It is not lowest number of moles that is limiting reagent, you have to take into account stoichiometry of the reaction. You have 1.58 moles of oxygen, these will react with 1.58/8 moles of pentane.

[chrisbb]

OK, got it. I knew I missed something out!
Thanks