If 15gram of potassium trioxochlorate V is heate in MnO2.What is the mass of chloride produce

2KClO3(s) + heat → 2KCl(s) + 3O2(g)

each mole of KClO3 produces 1 mole of KCl.

So, convert grams to moles KClO3, then back to grams KCl.

Or just multiply 15g * (molwt KCl/KClO3)