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# Homework help Watch

1. Aluminium burns with the following equation: 4Al + 3O2--> 2Al2O3

What is the maximum amount of aluminium oxide that can be made from 9 moles of O2?
2. (Original post by grace_wh)
Aluminium burns with the following equation: 4Al + 3O2--> 2Al2O3

What is the maximum amount of aluminium oxide that can be made from 9 moles of O2?
You should be using the equation: Mass = Moles*Mr

The number of moles of 3O2 is 9 and the Mr is 96.
from there you can work out the maximum mass of 2Al2O3
3. (Original post by homeland.lsw)
You should be using the equation: Mass = Moles*Mr

The number of moles of 3O2 is 9 and the Mr is 96.
from there you can work out the maximum mass of 2Al2O3
The mass has nothing to do with it. The question does not ask for mass, it asks for amount.

Just use the stochiometric ratios to find the amount.
4. I got 612g of aluminum oxide, is that right??
5. (Original post by coconut64)
I got 612g of aluminum oxide, is that right??
That would be correct! I'd be tempted just to leave the answer in moles (maybe that's a bit lazy but the question doesn't specify units)
6. (Original post by coconut64)
I got 612g of aluminum oxide, is that right??
The question doesn't ask for the mass.

(Original post by MexicanKeith)
That would be correct! I'd be tempted just to leave the answer in moles (maybe that's a bit lazy but the question doesn't specify units)
Definitely leave the answer in moles, as the questions specifies amount.

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