- (A) The decomposition reaction of potassium chlorate is
2KClO 3 (s) → 2KCl(s) + 3O 2 (g)Since 96.0 grams of O 2 were produced, which is 3 moles of O 2 , then 2
moles of KCl were also produced. Based on the Periodic Table, 2
moles of KCl has a mass of 149.2 grams.