Question

What mass of copper can be made from 79.5 g of copper oxide

Answer 1

Explanation:

2Cu+O

2

⟶CuO

Given mass of CuO=159g

1mole of Cu⟶63.5g

1mole of CuO⟶79.5g

From the reaction

2mol of Cu reacts with 2moles of CuO

1mol of Cu⟶79.5g

Thus 2mol of CuO⟶159g

159g of CuO⟶2mol of Cu

2mol of Cu⟶2x63.5g of Cu

⟶127g of Cu

Therefore, the mass of Cu required to produce 159g of CuO when heated in excess oxygen is 127g

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Answer 2

Answer:

63.5g of Cu

Explanation:

molecular weight of CuO= 63.5+16

=79.5g

79.5g of CuO gives 63.5g of Cu

79.5g of CuO gives =79.5* 63.5

79.5

==63.5g of Cu