Question

How many atoms are contained by 80 g oxygen

Answer 1

This means that there is 5 moles of oxygen as well as hydrogen meanin 6.022*10^23*5 atoms

Answer 2

Molecular mass of oxygen = 16 u

Given mass = 80 g

No. of atoms / 6.022 × 10^23 = given mass / molecular mass

No. of atoms = 80/ 16 × 6.022×10^23

= 30.11 × 10^23

= 301.1 × 10^22

Hope this will help u ...