00:02
Hi there.
00:03
To answer this question, i just want to write a generic equation.
00:08
So let's say we have 2a reacting with b to form 2a.
00:21
So just a generic reaction.
00:24
And we want to know, according to following stoichiometry, when we're trying to do a stoichiometric calculation, what we would need to do to relate the mass of one of our reactants.
00:37
Actually, let's pick the next one.
00:42
The mass of one of our reactants to the number of moles of the product.
00:52
Okay, basically, so it's asking how we get from mass of our element b here to moles of the product.
01:02
Well, what we need to do, to do one of these problems, is to convert first from mass, of our reactant to moles of our reactant.
01:13
And to do that, we need to use substance b's molar mass.
01:19
Molar mass is the mass of one mole of the substance, and we determine that by looking at the masses on the periodic table.
01:27
Then, once we have moles of our reactant, we can convert to moles of our product by using the mole ratio.
01:36
The mole ratio comes from the coefficients in the balanced equation, which is why we need.
01:46
A balanced chemical equation for stoichiometry...