Galena, the most common mineral of lead is primarily lead(II) sulfide (PbS). The first step in the production of pure lead is to oxidize lead sulfide into lead(II) sulfite (PbSO3). Lead(II) sulfite is then thermally decomposed into lead(II) oxide and sulfur dioxide gas. Balance the following equation. PbSO3(s)⟶PbO(s)+SO2(g)