Question

What amount (moles) is represented by each of these samples?b. 10.0 mg NO2c. 1.5 3 1016 molecules of BF3

Answer 1

To find the amount represented by 1.5x10^16 molecules of BF3 we have to use Avogadro's Number. It was stated that 1 mol of any substance contains 6.022x10^3 atoms or molecules of that substance, that is what we know as Avogadro's Number:

`1.5*10^(16)molecules\cdot(1mol)/(6.022*10^(23)molecules)=2.5*10^(-8)mol`

The answer is 2.5x10^-8 moles of BF3.