How many molecules of O₂ are produced when 32 g of O₂ is generated by the decomposition of 2KClO₃ → 2KCl + 3O₂?
Correct: D
Molar mass of O₂ = 32 g/mol. 32 g O₂ = 1 mol. From the reaction, 3 mol O₂ produced per 2 mol KClO₃. Number of molecules = 1 mol × 6.022 × 10²³ = 6.022 × 10²³ ≈ 6.0 × 10²³.