Question

What is the number of molecules in 0.25 moles of oxygen?

Answer 1

We know that :

1 mole of oxygen contains = 6.022 x 10²³ molecules . So,

0.25 mole of oxygen contains = 6.022 x 10²³ x 0.25 

= 1.505 x 10²³ molecules

Thus, 0.25 mole of oxygen contains 1.505 x 10²³ Molecules.