Every spider has a lens. So if I say how many lens we can't spiders have, you will all take this and say 8 lengths to 1 spider. The setup is the same. Your setting brings up to make sure you pick the fraction of your conversion factor that cancels out, and then you multiply and say, 80 away. So, again, things are coming away.
If we say every human being has 2 hands, so how many hands in this room will take 2 hands multiplied by everyone's room? Right? Same So if I'm looking at a water molecule, this is a molecule of water. In one molecule of water, your white say in 1 hydrogen atom sorry. In one water molecule, I have 1 oxygen atom.
We are going to be working with malls. Not so much same atom or molecules. So we're going to work with moles. What that means is I'm just going to take this and change it from atoms to moles. K?
So I'm going to and I'm just going to write this already in the, fractions. Or one more oxygen or one So I've been saying it. It connects to most of our questions. What you need is in the question itself. Right?
So I'm just pulling directly from what I've been given the formula. I'm pulling from the formula, and I'm gonna use it as a comparative factor. So our comparative factors come directly from the And then now from this conversion factors, we can determine the amounts of the elements present in whatever, amount of. The chemical formula and conversion factors, write the fractions, and then answer what will be given. Here are a couple of examples.
So we're gonna use the chemical formulas as conversion factors, constitute that formula or make up that formula. What are the constituent elements in calcium carbonate? How many do we have? 3. 3.
We have calcium is a constituent element. Carbon is a constituent element, and oxygen. 3. 3. We have calcium is a constituent element.
Carbon is a constituent element, and oxygen. 3. 3. We have calcium is a constituent element. Carbon is a constituent element, carbon is a constituent element, and oxygen.
So the question is, determine the number of moles of oxygen in 1.7 moles of calcium carbonate. We have our How many so we are going to write this as moles and call it a mole ratio. Atoms. I have one atom of oxygen. That means I have 1 mole of oxygen.
That means I have 1 mole of oxygen. That means I have 1 mole of oxygen. I have one atom of oxygen. That means I have 1 mole of oxygen. So how many what's my mole ratio?
How many calcium do I have? 1? We use those two dots for more ratio. How many moles of carbon? 1.
How many moles of oxygen? 3. 3. This one comes from that one, that one, and that 3. How many moles of calcium carbonate?
1. I have just 1 calcium carbonate. So that's my mole ratio. 1 to 1 to 3 to 1. This is the hardest part of this question.
And you've seen I'm saying hardest part, but you've seen where all these numbers come from. They come from the formula, which is even in the question. To write the entire unit. If I say modes, modes of 1. Right?
So then it will just make your life a lot less it will make you a lot less I write them for units, the whole yeah. Unit. And then I need more calcium carbonate to cancel out, so I'm gonna put this one here. One more calcium carbonate. What goes on top?
Oxygen. My unit now is moles oxygen. My question is moles oxygen. Okay? So example question of this.
You turn in the mass of sodium, imputing grams of sodium chloride. So I'm gonna tell you something first. So note here, we're not doing molds to molds. We're doing grams to grams. You cannot directly convert between brands between brands of any 2 things.
So what I'm saying, if I have any 2 things, thing a and thing b, there is no direct conversion between the 2. Of air. You must then convert this to moles of the same thing. What conversion factor do we use between grams and moles? What the margin factor we used to come back to?
Mort ratio. Just. And then once you have moles of b, you can then get grams of b. What do you use to convert from moles to grams? See how the questions start getting longer.
So each is So each is broken down into the first part of chapter 6. We need to more on Friday. We've done more tomorrow today, and we need more to ground on Friday. 99. Not round things.
Go ahead and try that. If you have no idea where to start, Does anybody help with this? Yes? So we need start with 2.4 grams of sodium. Yep.
And then, convert it to moles of sodium using the conversion factor 1 mole sodium over 22.99, grams of sodium? Yes. And then for 1 mole of sodium chloride, there's 1 more sodium? Yes. And then, for 1 mole I mean, in, 58.44 grams of sodium chloride over 1 mole of sodium chloride.
Yep. And what do you get? 6.1 grams of. I cannot stress enough the importance of. If you're struggling with convergence, please don't let today end without you understanding chapter 2 and 6.
Go to all the I don't wanna do this fast. I don't wanna do this fast. I don't understand. I don't understand. I'm getting a I know.
I don't biometrics. I don't have I have the option. So, like, I could either take