Chemistry help!!!!

Question

Solid potassium chlorate (KClO3) decomposes into potassium chloride and oxygen gas when heated. How many moles of oxygen form when 60.1 g completely decomposes?

Answer 1

2KClO3 ==> 2KCl + 3O2

60.1 g KClO3 x 1 mole/123g = 0.489 mokes

moles O2 = 0.489 mol KClO3 x 3 mol O2/2 mol KClO3 = 0.734 moles O2