The chemical reaction pathway begins with Zinc (Zn) reacting with sulfur (S) to form Zinc Sulfide (ZnS). Then, Zinc Sulfide reacts with hydrogen sulfide (H2S) to form pure sulfur (S). Sulfur then reacts with oxygen (O2) to form Sulfur Dioxide (SO2), which further reacts with oxygen to form Sulfur Trioxide (SO3). Sulfur Trioxide reacts with water (H2O) to form Sulfuric Acid (H2SO4). Finally, Sulfuric Acid reacts with Barium Sulfate (BaSO4) to form the final product, Barium Sulfate.