 Okay. What is the molecular mass of table sugar for sucrose C12H22O11 and what is its molar mass in grams per mole? Okay? So let's write down what it gives us. It says sucrose is what we're looking for C6H22. I made C12H22. Okay. So it asks first for the molecular mass. So we've been calling that the molecular weight. It's the same thing. Okay? So remember how to do these. You know, you just look at the periodic table. The thing is, is when we're talking about molecular weight, it's the weight of one molecule in particular as opposed to a mole of molecules. Remember a mole is Avogadro's number. So that's a lot of molecules, right? This is just one. So how many, what we're really doing is adding up these atoms, 12 times however much carbon atom weights, 22 times however much hydrogen atom weights, and 11 times however much oxygen atom weights. So let's just do that. So we get those values of course from the periodic table. So 12 times the atomic weight of carbon, right? 12.01. I got that from the periodic table. And then remember that's an AMU or a Dalton's if you want. But we've been using AMU most of the time. So then 22 times hydrogen just adds those goods. So let's go to two digits past the decimal. So 3, 4, 2.30. So that's how much one molecule of sucrose weights. Is that okay? Any questions on that particular part? So the next question I'd ask is, what is the molar mass in grams per mole? Well that's really nice. They actually gave us the units for grams per molar mass. But you normally have to be given those units because you should know them. So remember, I did some formal calculations of the molar mass on Wednesday I think for you guys. So if you want to, I did one for each one of the classes of different ones. I think I did water and carbon disulfide for each of the classes. Go back and look at those. I don't say, I say don't do that formal calculation every time. Just recall that when you get the molar mass it's going to be the same number with these digits, or with these units being different. Okay? So it's going to be effectively the same thing. You look up at the periodic table and we're just going to really quickly, formally calculate it out since I'm recording it all right and the whole thing out. And you guys can stop me if you're having trouble understanding where I'm getting this from. How much does one molecule of sucrose weigh? 342.30 amu. So this is one molecule. And how much does one mole weigh? Or what does that mean? 6.022 times 10 to the 23rd molecules of sucrose. Does that make sense? Kind of, right? So again, you know, so if you look at the periodic table it gives you the amu, right? Remember that you can do the formal calculation using Avogadro's number. But the quick and dirty way is to just change the units, yes. So formally we're not just changing the units, right? Is there any questions about that? Okay, good.