Question

If you have 3.45 × 1015 atoms of iron, how many moles of iron do you have?

A. 3.45 × 1015 moles

B. 5.73 × 10–9 moles

C. 2.08 × 1024 moles

D. 9.47 × 1038 moles

E. 6.02 × 10–23 moles

Answer 1

opposite as your last question. this time devide by avogadro's numver.
3.45E15 / 6.02E23 = 5.73E-9
So B

Answer 2

Thanks!