Barrons SAT Subject Test Chemistry, 13th Edition

46. (E) The equation is:

2KClO 3 (s) → 2KCl(s) + 3O 2 (g)

This shows that 2 mol of KClO 3 yields 3 mol of O 2. Three moles of O 2

= 3 × 22.4 L = 67.2 L of O 2.