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# What do u do watch

1. Copper oxide is reduced by excess hydrogen. Calculate the maximum mass of copper that could be obtained from 79.5 g of copper oxide.CuO H2 → Cu H2Ohow do u work this out????
2. You have the balanced equation: CuO + H2 --> Cu + H2O. You can use stoichiometry and see there is a 1:1 molar ratio between CuO and Cu.

1) work out the moles of CuO.
- mol=mass/mol mass = 79.5g/(63.5+16.0) = 1 mol CuO

2) work out mol Cu
- from the 1:1 mol ratio you know if you have 1 mol CuO you must have 1 mol Cu. So mol Cu=1 mol

3) work out mass of Cu
- mol=mass/mol mass therefore mass= mol x molar mass = 1 x 63.5g/mol-1 = 63.5g Cu

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Updated: November 6, 2017
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