When copper (II) oxide is heated with hydrogen gas, water and copper metal is produced. What mass of copper can be obtained if 32.0g of copper (II) oxide is used?

A: 24.3g

B: 25.5g

C: 27.6g

25.5 g

Explanation:

First, you will need a balanced chemical equation

CuO + H₂ = => H₂O + Cu

From the equation above, we can see that for every 1 mole of CuO (copper (II) oxide), 1 mole of Cu (copper) is produced.

Convert grams of CuO to moles. You should get 0.402 mol. Now with the relationship established above, you can see that you should ideally get 0.402 mol. Convert this to grams. Your answer should be 25.5 g.