Question

What molar quantity is represented by `3.011xx10^23*"magnesium atoms"`?

Answer 1

If I have a half a dozen magnesium atoms, how many atoms would that be?

Explanation:

And this question is PRECISELY the same as the one you asked EXCEPT that we use `"the dozen"` as our metric instead of the `"Avocado number"`, i.e. `N_A=6.022xx10^23*mol^-1`

And so we take the product...

`6.022xx10^23*mol^-1xx0.5*mol-=3.011xx10^23*"magnesium atoms"`. You know the mass of this quantity....

Answer 2

`3.01 xx10^23` `"atoms"`.

Explanation:

`6.02xx10^23` (Avogadro's constant) indicates the number of atoms in a mole of any element, so basically:

`"1 mole of Mg " -> " " 6.02 xx10^23` `"atoms"`
`"0.5 moles of Mg " -> " " "? atoms"`

So

`"0.5 moles" xx ( 6.02xx10^23 "atoms")/"1 mole"`

which equals to half of Avogadro's constant.