Question

Potassium chlorate decomposes on heating to form potassium chloride and oxygen gas. When 24.5g of potassium chlorate is decomposed completely then 14.9g of potassium chloride is formed. Calculate the mass of oxygen formed. State the law of chemical combination which u have used in solving this problem. ​

Answer 1

Potassium chlorate is decomposed into potassium chloride and oxygen. The mass of oxygen can be calculated by the help of law of conservation of mass that states" Total mass of reactants must be equal to amount of products". As amount of potassium chlorate is given i.e. 24.5 g and amount of potassium chloride is also given. We can calculate the amount of oxygen by subtracting both masses. The mass of oxygen is 9.6 g. The solution is in given image.