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?

$2KClO_3→2KCl+3O_2$
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 formed = 24.5 – 14.9 = 9.6 g
The law of conservation of mass by Antoine Lavoisier is used in solving this problem.

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Updated on: 10-Oct-2022

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