Question

convert in moles 8g of oxygen gas

Answer 1

32g oxygen is 1 mole.

Hence 8g Oxygen is

(1/32)*8 moles

=1/4 moles

Answer 2

So 32 grams of oxygen gas=1 mole. I'm sure you can take it from here, but if not 8 grams of oxygen is 8/32 of a mole of 0.25 moles