Which of the following has number of molecules present equal to those present in 16 grams of oxygen

16 grams of oxygen=$\frac{16}{32}\mathrm{N}=\frac{1}{2}\mathrm{N} \mathrm{of} \mathrm{molecules}.$

16g O₃ = $\frac{16}{48}\mathrm{N}=\frac{1}{3}\mathrm{N} \mathrm{of} \mathrm{molecules}$

32g SO₂= $\frac{32}{64}\mathrm{N}=\frac{1}{2}\mathrm{N} \mathrm{of} \mathrm{molecules}$

16g SO₂= $\frac{16}{64}\mathrm{N}=\frac{1}{4}\mathrm{N} \mathrm{of} \mathrm{molecules}$