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The percentage of oxygen in copper oxide when hydrogen is passed over 2 g of heated copper oxide till no copper oxide is left and the mass of copper obtained is 1.6 g is

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Detailed Solution

The percentage of oxygen in copper oxide is 20%.

The mass of copper obtained = 1.6 g
Loss of oxygen $= 2 - 1.6$ $\Rightarrow 0.4 g$

The loss of 0.4g is the loss of oxygen from copper oxide.

Percentage of oxygen lost = $\frac{0.4}{2.0} \times 100$
$\Rightarrow 20 %$ .

the mass of copper obtained is 1.6 g.
The percentage of oxygen in copper oxide when hydrogen is passed over 2 g of heated copper oxide till no copper oxide is left is 20%.

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