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12.976 g of lead combines with 2.004 g o...

12.976 g of lead combines with 2.004 g of oxygen to form `PbO_(2). PbO_(2)` can also be produced by heating lead nitrate and it was found that the percentage of oxygen present in `PbO_(2)` is 13.38 %. With the help of given informations, illustrate the law of constant composition.

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In both cases percentage of oxygen is the same, so the law of constant composition is illustrated.
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