5. The head of matches contains anodizing agent such as potassium chlorate, Kios, together with tetraphosphorus trisulfide, P.5, glass, and binder When struck either by an obect or on the side of a box of matches, the phosphorus suffie compound is easily ignited, causing the potassium chlorate to decompose Into potassium chloride and oxygen. The oxygen in tum causes the
phosphorus solide to burn more vigorously
Determine the addition number of chlorine in potassium chlorate.