Which number should be placed in the blank to balance the equation 4Fe + ___ O2 → 2Fe2O3?
2
3
4
5

Question

Which number should be placed in the blank to balance the equation 4Fe + ___ O2 → 2Fe2O3?
   2 
   3 
   4 
   5

anonymous · Answer

2 *O3 = how many oxygen atoms?

anonymous · Answer

?

anonymous · Answer

let me rephrase that
how many oxygen atoms are in  3Fe2O3?

anonymous · Answer

... i actually don't know that's why I'm asking for help xP how do you find it? O.o

anonymous · Answer

http://openstudy.com/code-of-conduct Fe2O3 has 3 oxygen atoms in it so 2(Fe2O3) has how many oxygen atoms in it?

anonymous · Answer

I beleive its 5?

anonymous · Answer

2*3=?

anonymous · Answer

6

anonymous · Answer

so how many oxygen atoms are on the right side?

anonymous · Answer

...
there are 6 oxygen atoms on the right side........
2Fe2O3

anonymous · Answer

wait but how do I find the answer then? lol sorry x3 I was going off of the answers it gave me :P

anonymous · Answer

$$2Fe_2O_3$$
since we know there's a total of 6 oxygen atoms on the right sides
this means there must be a total of 6 oxygen atoms on the left side

$$AO_2$$
so we need to determine the number of oxygen molecules
since an oxygen molecules contains 2 oxygen atoms
we can conclude
A*2=6

A=?

anonymous · Answer

ooooooooooooooohhhhhhhhhhhhhhhh lmao xD A=3 :D

anonymous · Answer

Thanks sooooo much ;)

anonymous · Answer

this means there can be a total of 3 O2 in order to make the entire thing balanced