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What quantity of copper (II) oxide will ...

What quantity of copper (II) oxide will 2.80 litres of hydrogen at N.T.P. ?

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The correct Answer is:
9.94 g

The balanced chemical equation is :
`underset(underset("79.5 g 22.4 L at N.T.P")("1 mol 1mol"))(CuO+H_(2))rarrCu+H_(2)O`
22.4 L of `H_(2)` react with CuO at N.T.P = 79.5 g
2.8 L of `H_(2)` react with CuO at N.T.P `= ((79.5g))/((22.4L))xx(2.8L)=9.94g`.
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