 Okay, so let's say the problem says you have 52.4 grams of water, how many moles of water do you have? Okay, so the mass of water, 52.4 grams. So, is everybody okay with that? That's given. We can even write water if we want to. Sometimes it's easier to do that. How will we get moles out of this? What would we have to do? Multiply by grams or multiply by the ratio, right? Multiply by the ratio and what ratio would that be? What would be on the bottom? 18.02 grams, right? 18.02 grams, why? Because we have to cancel out the grams. So what are we doing with this thing? Remember, this thing looks like this. 18.02 grams per mole, right? That's the long way of writing. So what are we doing? We're flipping that over, right? Yeah, so we can flip one over for both ways, okay? So, just like you guys said, 18.02 grams of water is one mole of water. Is that going to give us the number of moles of water that we have in 52.4 grams? Yeah, cancel, cancel, sure enough, okay? So remember, this is all chemistry is, okay? This is just a new, this is just a new conversion factor that you guys know, okay? So 52.4 divided by 15.02 and that equals 2.91 grams. Sorry, that doesn't mean moles of water. Everybody cool with that? Okay, good, so new conversion factor you guys get, right? You get it? Get it, get it, get it, get it, get it, okay, good.