Question

The mass of a carbon atom is 2 x 10^-21 g.
How many carbon atoms are there in 6g of carbon?​

Answer 1

You must divide mass of carbon by mass of carbon atom.

`\frac{6\mathrm{g}}{2\cdot10^(-21)\mathrm{g}}=3\cdot10^(21)=3\mathrm{Z}`

There are 3 zetta atoms of carbon in 6g of carbon.

Hope this helps.