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You can find atoms, molecules, and formula units using Avogadro’s constant because scientists have determined 6.022x10^23 of atoms/particles/ molecules is equal to 1 mol. You can use the substance’s molar mass to calculate what is being asked for. For example if you were given to find the mass of an element with x amount of atoms then you know that one mole of the element is 6.022^23 atoms. If you divide the amounts Then that would result in moles at which point you can multiple by the molar mass to reach grams.
When I have asked this question before, I think the most helpful answer is that Avogadros number is simply a quantity. Just as a "dozen" donuts represents 12 donuts, Avogadro's number of donuts would be 6.02x10^23 donuts. Avogadro's number can be used to quantify anything, but we use it frequently when discussing atoms, molecules and formula units because they are so small. Does that make sense? If not, I can explain further.:)
You have to think of each of these terms as a unit. Even though molecules have more atoms, they are still joined, thus they are one unit. The same thing applies to formula units. This is why Avogadro's number applies to all of it. An easy way to think of Avogadro's number is the same way to think about a dozen. You can have a dozen of anything. You can have a dozen loaves of bread. Even though there are multiple slices of bread, the term dozen still accounts for all of it.
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