- #1
dacoolguy
- 3
- 0
Homework Statement
4Al + 3O2 = 2Al2O3
What number of O-atoms will react if 45dm3 of the gas reacts with an excess of Al?
The answer is apparently: 4 atoms
Homework Equations
The Attempt at a Solution
Using the formula n=V/Vn (or the law stating that any gas occupies 22.4dm3 at STP), I found that the number of moles was (225/112) or 2.01. Then I used the formula: n=n*Na (number of moles times Avagadro's Constant) giving me 1.24*1024 atoms. Where did I go wrong please?