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Avogadro's number (6.022 x 10^23) represents the amount of something (for example atoms) contained in 1 mole of a substance. One way we have used it so far is when converting from number of atoms to moles, or vice versa. If given the amount of atoms, divide by Avogadro's number to find the amount of moles. If given the amount of moles, multiply by Avogadro's number to find the amount of atoms.
One mole has 6.022 x 1023 (or Avogadro's number!) of something. Moles do not always have to be used for molecules and atoms, but they typically are associated with them since Avogadro's number is very large. For example, if you are given a certain number of atoms of an element, you can find the number of moles of that element by dividing the given number of atoms by Avogadro's number (1 mole = 6.022 x 1023). :)
avogadro's number is used to determine how many "formula units" are in one mole. if you're talking about a molecule, make sure you're using the constant and converting to molecules. Whereas if you have an atom, it's 6.022E23 atoms=1 mole
Avogadro's constant is 6.02x10^23, and you use it when you want to determine how many "formula units" (you might see this term in the textbook!) are in a mole. Most times it is used to calculate how many atoms / molecules are in a mole of substance.
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