Example 2. Copper oxide was prepared by two
different methods. In one case, 1.75 g of the metal
gave 2.19 g of oxide. In the second case, 1.14 g of the
metal gave 1.43 g of the oxide. Show that the given
data illustrate the law of constant proportions.
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Answer: In the first method Cu : O (1.75 : 2.19) = 0.79
In the second method Cu : O (1.14 : 1.43)= 0.79
By observing these two methods we came to know that it follows the law of constant proportion as the ratio of both Cu and O in copper oxide is the same.
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