 You know me Calculate the number of grams of glucose. How about that one? That'll be a harder one. Calculate the number of grams of glucose in 7.50 times 10 squared mils, so 750 mils of a 15 percent glucose solution So remember percent weight volume It's going to be what a mass of the solute, right guys? in grams is going to help the other one and over the volume, right? Solution, right, yeah, and Millie, right? times 100 percent Okay, so let's write down what we know from the problem. Okay, so do we know the mass of the solute? So that's what we're looking for Do we know the volume of solution and is it in milliliter? Yeah, so we're cool. What is it? But we also know what the concentration of the solution right which is in this case We can write percent weight volume we know so we'll put that all in like a little bracket because it's just one thing Okay And what is it? 15.0% Okay So Actually, if you want to think about it, it's actually percent grams per mil Okay, so you if you're doing it this way you kind of need to if you want to cancel out your units Like I always teach you the way to write your units would be like this Or A lot easier, so let's just Manipulate this equation in a way that isolates our m variable. Okay, so Let's just for right now instead of having all this All this dv W all that stuff. I'm just gonna make it x. It'll be easier. Okay Times 100% right equals that so okay Okay, so we're trying to solve for also write it like this Right, because that's the same thing So what do we got to do? We got to multiply both sides by B, right? Everybody okay with that? So what do we got now? We got Vx equals m This is easier to understand So Vx equals m times what? times 100% Still add percent grams mils. Okay grams per mil. That's all that you use But for right now, let's just not put those other units because it looks like it's good We'll put them away. Okay, so How do we isolate m we divide both sides by what? Cancel out mills right and we're gonna have to does that make sense why I'm doing that 100% now you can say it. Okay, so do it all up except for one of them the one that we want So let's percent cancels with percent and what are we left with great? Is that what we want? Is that a good mass number? Okay, cool What do you guys get 113 right 113 grams and if you want to grams of glucose Right Why is it 113 and not 112.5? Because of six right So that was a harder one, but not so hard, right? Yeah, not so hard, but Okay, any other questions on that? I think the weirdest thing about these is if you like to do like me cancel units You got to remember that it's actually percent mass volume, you know So you got to put those units there But if you don't like canceling units like somebody just throw numbers all over the place and get the right answer somehow Then that's cool, too, you know Okay