Question

How many moles of KCl are produced using 3 moles of KClO3

Answer 1

Start by writing the balanced equation for the decomposition of potassium chlorate.

Answer 2

2KCLO3------->2KCL+3O2

Answer 3

Excellent! Now look at the mole ratio in the balanced equation. 2 moles of potassium chlorate decomposes to produce 2 moles of potassium chloride. That is a 1 : 1 ratio. (2 : 2 reduces to 1 : 1). So, however many moles you have of potassium chlorate decomposing, an equal number of moles of potassium chloride will form, in this reaction. Got the idea?