Question

How many moles are in `7.5*10^78` atoms of zinc?

Answer 1

Hmm `(7.5xx10^(78) " zinc atoms")/(6.022xx10^23" zinc atoms "mol^-1)` `=` `??? mol`

Explanation:

So this approximately `10^55` `"moles"`. Given that world production of zinc was approx `1xx10^9` `g`, in 2015, approx., `10^7` moles, this amount probably represents more of the metal than exists on Earth, and possibly more than the entire amount of zinc present in the solar system. So this is not a serious question.