In the following questions two or more options may be correct.
One mole of oxygen gas at STP is equal to _______.
One mole of oxygen gas at STP contains Avogadro’s number of molecules. The question mentions oxygen gas so it will contain 6.022 × 1023 molecules of oxygen, O2 not atoms.
One mole of O2 contains 16x2 = 32g of oxygen.
The correct options are →i) and →iv).