Question

What is the no. Of molecules in 15 grams of carbon powder?

Answer 1

Molecular weight of carbon is 12 g

So for 12 g ; we have $6.023*10^{23}$ molecules of carbon

For 15 g; we have $6.023*10^{23}*15/12$ molecules of carbon

                             = $7.528*10^{23}$ molecules of carbon