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QUESTION

# Hi, Why do some textbooks say that Avogadro's number is 602 sextillion ? I wrote out the full number and wrote the number above each set of zero's and it is 602 hexillion.

Hi Ash

You've miscounted a little there: the second bottom row should be millions (10^6), not hundreds of thousands. That throws you off by one line all the way through... which means that you do get to sextillion, counting correctly.