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Copper oxide was prepared by two different methods. In case, \( 1.75 \mathrm{~g} \) of the metal gave \( 2.19 \mathrm{~g} \) of oxide. In the second case, \( 1.14 \mathrm{~g} \) of the metal gave \( 1.43 \mathrm{~g} \) of the oxide, show that the given data illustrate the law of constant proportions.
\( \mathrm{P} \)
W)
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