How many grams of potassium chloride (KCl) will form if 9.0 grams of potassium chlorate (KClO3) decomposes?

Answer 1

Write the balanced equation for the reaction taking place:

2KClO3 ==> 2KCl + 3O2 ... balanced equation

This tells us that 2 moles of KCl will form from 2 moles of KClO3. We are given g of KClO3 so convert that to moles and then that will give you moles KCl formed. Convert that number of moles of KCl to grams of KCl