Question

`39 x 10^22` molecules of `CO_2` is equal to how many moles of `CO_2`?

Answer 1

Well, one mole of molecules specifies `6.022xx10^23` individual molecules........and we get a bit over a half a mole of molecules.

Explanation:

You have `3.90xx10^23` molecules, and the molar quantity is the simply the quotient,

`(3.90xx10^23*"molecules")/(6.022xx10^23*"molecules"*mol^-1)` `=` `??mol`