Question

What is the number of representative particles in 3.0 mol `Sn`?

Answer 1

There are `3xxN_A" tin atoms"` in `3.0` `mol` of tin metal, where `N_A` is Avogadro's number, `6.022xx10^23` `mol^-1`.

Explanation:

If I simply wrote `3xxN_A`, I think that would be an acceptable answer. Of course, you'll have to do the multiplication.

So why do we use the number `N_A`?

`N_A` has the property that `N_A` `""^1H` atoms have a mass of `1.00` `g`. `N_A` `""^12C` atoms have a mass of `12.00` `g`. And `N_A` `Sn` atoms has a mass of `118.7` `g`. What is the mass of your quantity?