1.5 moles of oxygen atoms are present in

Explanation:

3 moles of oxygen atoms are present in 1 mole of BaCO₃

So, 1 mole of oxygen atoms are present in ⅓ mole of BaCO₃

Hence 1.5 mole of oxygen atoms are present in ⅓ × 1.5 = 0.5 mole of BaCO₃

Final Answer:

Option A is correct i.e : 0.5 mole of BaCO₃