00:01
In this equation, we're going to look at balancing a reaction.
00:05
And we're told this information that solid iron is going to react with oxygen to produce an iron three oxide.
00:12
So the first thing we need to recognize is that oxygen exists in a diatomic form as a gas, so it's going to be 02.
00:20
The iron three, the roman numeral, that's part of the name, represents the charge on the iron.
00:26
So it's roman numeral 3 means plus 3 charge on this cation.
00:32
And the oxide that's involved here is going to have a minus 2 charge associated with it.
00:41
So basically you're going to have to balance a plus 3 minus 2 charge in the iron 3 oxide here.
00:51
So a good approach to take is kind of find the least common factor.
01:02
Associated with both three and two.
01:05
And if you multiply them together, they're going to give us six.
01:07
So that's our factor, our common factor.
01:10
And so we're going to need two irons here and three oxygens, giving us overall a plus six charge for the irons and a minus six for all three of these oxygens.
01:23
And now we have the formula associated with the iron three oxide and the formulas for the reactants as well.
01:29
Now we just need to make sure everything balances in terms of the atoms.
01:34
So we can see that we have two irons existing here.
01:40
But we also notice that the oxygens don't balance...