Question

What is the mass of `6.2 * 10^20` molecules of carbon monoxide?

Answer 1

First find how many moles are present by comparing with Avogadro's Number: `n=(6.2xx10^20)/(6.02xx10^23)=0.001` `mol`

The molar mass is `12+16=28` `gmol^-1`.

To find the mass, `m=nM=0.001xx28=0.028` `g`.