Potassium chlorate decomposes, on heating, to form potassium chlo… - Vidyadip

Question

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?

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Answer

$\text{Potassium chlorate}\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\text{Potassium chloride}\ +\ \text{Oxygen}\\ \ \ \ \ \ \ \ \ \ \ ^{(24.5\text{gm})}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ^{(14.9\text{gm})}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ^{(\text{x gm})}$
Let, $x$ gm of oxygen is formed, Then, according to law of conservation of mass, $24.5gm = 14.9gm + x gm$
So, $x = (24.5 - 14.9)gm = 9.6gm.$
Thus, $9.6$ gm of oxygen is formed in the reaction.

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