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Copper forms two oxides following law of...

Copper forms two oxides following law of variable proportions. One gram of each oxide in hydrogen gas gave 0.799 g and 0.888 g of the metal respectively. Give the composition of these oxides.

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Oxide (A) : weight of copper = 0.779 g
weight of oxygen = 0.201 g
weight of oxygen = 0.201 g
weight of metal per gram of oxygen = 3.97 g
Oxide (B) : wt of copper = 0.888 g
weight of oxygen = 0.112 g
The ratio fo weights of metal reacting with same weight of oxygen = 1 :2
The oxides are `CuO and Cu_(2)O`
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