Question

The mass of an oxygen ion

Answer 1

16.00 amu
1 mole of oxygen is 6.02×1023 atoms of oxygen

Answer 2

1 mole of oxygen atoms weight= 16 u

Since 1 mole of oxygen atoms contains

=6.023 × 10^23 atoms of oxygen

So 1 oxygen ion weight = 1 / (6.023 × 10^23) u