00:01
For this question, we have the combustion of propane to produce carbon dioxide and water.
00:05
And we want to know if we start with 2 .5 moles of oxygen and 4 .6 moles of propane, how many moles of water can we produce? so for a question like this, you do have to have two different setups because we were given the starting amounts of both of the reactants.
00:18
And we don't know which one is limiting or which one's in excess.
00:21
So we're going to convert each reactant to our product of water.
00:25
And then we'll talk about how to determine which answer is the correct answer.
00:28
So starting with oxygen, we've got 2 .5 moles of oxygen.
00:34
We're already in moles, and we're just converting two moles, so we're going to use a mole ratio to get to moles of water.
00:40
This just comes from the coefficients and the balanced chemical reactions.
00:43
We're going to have four moles of water on top and five moles of oxygen on the bottom.
00:51
And again, those numbers just came from our balanced chemical reaction.
00:56
We'll multiply everything on top, and then divide everything...