How many moles of tungsten atoms are in 4.8 x 10^25 atoms of tungsten?

Question

Thanks for the help.

1. 8.0 x 10^2 Moles

2. 8.0 x 10^1 Moles

3. 1.3 x 10^-1 Moles

4. 1.3 x 10^-2 Moles

Answer 1

No. of moles = No. of molecules / N(A)

N(A) = Avogadro's no. = 6.023 *10^23

No. of moles = 4.8 *10^25 / 6*10^23

= (4.8 / 6)*10^25/10^23

=8.0*10^2 moles

  

Answer 2

4.8 x 10^25 / 6.022 x 10^24 = 7.97 x 10^1

So it would be the second answer