00:02
And there, in this question, we are given this balanced chemical equation.
00:06
And balanced chemical equations are important in stoichiometry problems, such as this one, we're trying to convert from moles of one thing to moles of something else.
00:17
These balanced equations are important because they give us the mole ratio, in which the reactants react and the products are formed.
00:24
In other words, from this balanced equation, looking at the coefficients, we know that four moles of iron are needed for every three months.
00:33
Of oxygen.
00:36
And these are going to produce two moles of the rust.
00:43
All right.
00:44
So we have a four to three to two ratio.
00:47
We are always going to see this ratio of moles here.
00:51
Well, what we're given in the question is we have 1 .8 moles of the iron.
00:58
And we want to know how many moles of rust can be formed...