![]() ![]() If the average atomic mass is 12.01 universal atomic mass units, the molar mass is going to be 12.01 grams per mole of carbon. Well, what's that going to be? Well, we can get that from the average atomic mass of carbon. Now, what is this going to be? Well, this is going to be equal to, it's going to be in our numerator, we're going to have six moles of carbon times the molar mass of carbon. Times as many carbon atoms or six moles of carbon. Glucose is because this, if we assume this is a mole of glucose, every molecule of glucose has six carbons. Why it's six moles of carbon divided by one mole of Is going to be the mass of six moles of carbon divided by the mass of one mole of glucose? And once again, the reason So one way we could think about it is, we say okay, for every mole of glucose, we have six moles of carbon. Let's just assume that this is a mole, this is a mole of glucose. But to help us think this through, we can imagine amount. Of glucose doesn't matter is because the percent carbon by mass should be the same You the average atomic masses of carbon, hydrogen, and oxygen. Percentage of carbon by mass of my sample? Pause this video and think about it. I'm not even gonna tell you its mass, but based on the molecular formula, can you figure out the And so let's just say that I had a sample of pure glucose right over here, this is my little pile of glucose. So right over here, I have the molecular formula for glucose. ![]()
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