Question

A sample of vitamin C is known to contain 2.58 × 10²⁴ oxygen atoms. a) How many moles of oxygen atoms are present in the sample? b) Find moles of oxygen molecules present in the sample.

Answer 1

Dear student,

a)1 mole of oxygen atoms = 6.023×10^23 atoms

∴Number of moles of oxygen atoms = 2.58 ×10²⁴ / 6.022×10²³

= 4.28 mol

4.28 moles of oxygen atoms.
b)
1 mole of oxygen molecule =2×6.023×10^23 atoms .
∴Number of moles of oxygen molecules = 2.58 ×10²⁴ / 2*6.022×10²³
=2.14 mole .

I hope you understand