2KClO3 —> 2KCl + 3O2

Question

how many moles of O2 are produced from 19 moles of KClO3

Answer 1

2KClO₃ ==> 2KCl + 3O₂ This is the correctly balanced equation. If you look at it, it tells you that TWO moles of KClO₃ decompose to produce TWO moles of KCl and 3 MOLES of O₂. Knowing these ratios, we can answer the question of "how many moles of O₂ are produced from 19 moles of KClO₃.

19 moles KClO₃ x 3 moles O₂/2 moles KClO₃ = 28.5 moles of O₂