Question

How do you calculate the mass of `3.24x10^18` atoms of iron?

Answer 1

Less than a milligram of iron.

Explanation:

It is a fact that `"Avogadro's number"` of iron atoms have a mass of `55.85*g`.

Since `"Avogadro's number"` `=` `6.022xx10^23`, mass of iron, `=` `55.85*gxx(3.24xx10^18)/(6.022xx10^23)` `=` `3xx10^-4*g`.