Question

How many moles of sodium (Na) do you have in a sample of 9.8 × 10^23 atoms Na?

0.61 mol Na

1.6 mol Na

5.9 mol Na

16.3 mol Na

Answer 1

1 mol ----------- 6.02 x 10²³ atoms Na
( mols Na) ------ 9.8 x 10²³ atoms Na

( mols Na ) = ( 9.8 x 10²³ ) x 1 / 6.02 x 10²³

( mols Na) = 9.8 x 10²³ / 6.02 x 10²³

= 1.6 mols Na

hope this helps!