So this is, let me do this in a new color, 0.189 grams of potassium chloride, which is exactly what they are asking us. Significant figures, which is 0.189 grams. Of things and dividing, so I have to take the minimum number of significant figures, which is three. Barley has anti-inflammatory and antioxidant properties. Of the information I used, I have three significant figures here, I have three here, I have four here, I have four here. Barley is composed of insoluble and soluble dietary fiber, which lowers cholesterol and reduces the risk of cardiovascular diseases. My significant figures or my significant digits here. So I have 0.099 divided by 39.10, divided by 39.10, times one, times 74.55, times 74.55, is going to be equal to that. And so then, this will cancel with this, and this will tell me how many grams of potassium chloride I actually have. This by the molar mass, times 74, and I'm gonnaĭo this in another color, just makes it look nice, 74.55 grams of potassium chloride for every mole of potassium chloride. Is going to tell me moles of potassium chloride, but I wanna know the mass I have one mole of potassium chloride for every one mole of potassium. And so, whatever this number is, I'm gonna have the same number of moles of potassium chloride, but just to make that clear, Now, I have exactly one potassium atom for every potassium chloride molecule. One mole is equivalent to 39.10 grams, if we're dealing with potassium. So I'm gonna multiply that times, one mole of potassium has a mass of how many grams of potassium? And we can see it right over there. Of potassium chloride, because they give us the molar mass. Moles of potassium chloride, well then I know the mass The same number of moles of potassium chloride, and Moles of potassium I have, all the potassium is presentĪs potassium chloride. And now I can use that to figure out how many moles of potassium I have. So mass of potassium, that is going to be my 0.450 grams times 22%, which is going to be equal to, I'll get my calculator out, 0.450 times 22%, or. Mass of my supplement," and multiply it by 22% to figure out what is the mass of potassium I have. In the potassium supplement? Well what I could do is, I could say, "All right, what's the total And so, how do we thinkĪbout how many grams of potassium chloride are And that is, I think, all we will need the periodic table of elements for. It as 39.10 grams per mole of potassium, could write it like that. That's its average atomic mass, but you could also view So they already give us the molar mass of potassium chloride, but it'll be useful for us to know the molar mass of potassium itself. You might need a periodic table, so I'll give you one right over there. See if you can figure that on your own, and I will give you a hint. Potassium chloride are in the potassium supplement? So pause this video and Which has a molar mass of 74.55 grams per mole. The potassium is present in the supplement as potassium chloride, Told that a 0.450 gram potassium supplement containsĢ2% potassium by mass.
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