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Mass Number and Representation of Atom

Potassium chl...

Question

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

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Solution

According to the law of conservation of mass, The sum of the mass of reactansta is equal to the sum of the mass of products.
KClO₃ ------> KCl + 3/2 O₂
Total mass of reactants = Total mass of products
This implies,
Mass of reactant = 24.5g
Mass of KCl = 14.9g
Therefore mass of oxygen obtain = (24.5 - 14.9)
= 9.6 g

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