Question

20 g of O atom calculate the moles

Answer 1

Moles =mass /molar mass.
Moles=20/16
=5/4

Hope it helps..

Answer 2

$<b>No. of moles = Given mass / Molar Mass</b>$

Given mass = 20 g

Molar mass = 16 g

No. of moles = 20 g / 16 g

= $<b>1.25 moles</b>$