It gives the number of atoms or molecules of a substance which will be present in one mole.
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It is 6.02 (times) 10 to the power of 23
Avogadro's number (generally written as 6.02 x 10^23) is the number of atoms or molecules it takes to have one mole of a particular atom or molecule. For example, one mole of Hydrogen is just 6.02 x 10^23 atoms of hydrogen.
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you can tell cause odd numbers have something left over
Any number that has a 5 or 0 in the ones place is divisible by 5. If a number is evenly divisible by another number, it is NOT prime.