# Potassium Chlorate Decomposes, on Heating, to Form Potassium Chloride and Oxygen. When 24.5 G of Potassium Chlorate is Decomposed Completely, Then 14.9 G of Potassium Chloride is Formed. - Science

Short Note

Potassium chlorate decomposes, on heating, to form potassium chloride and oxygen. When 24.5 g of potassium chlorate is decomposed completely, then 14.9 g of potassium chloride is formed. Calculate the mass of oxygen formed. Which law of chemical combination have you used in solving this problem ?

#### Solution

Chemical reaction:

2KCIO→ 2KCI + 3O2
24.5 g       14.9 g

So, mass of oxygen formed during the reaction:

Mass of reactants = 24.5 g

Mass of products = mass of the potassium chloride + mass of oxygen

24.5 = 14.9 + mass of oxygen

Mass of oxygen = 24.5 – 14.9 = 9.6 g

We have used the law of conservation of mass, proposed by Antoine Lavoisier, to solve this problem.

Concept: Laws of Chemical Combination - Law of Conservation of Mass
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#### APPEARS IN

Lakhmir Singh Class 9 Chemistry - Science Part 2
Chapter 3 Atoms and Molecules
Hots Questions | Q 76 | Page 131