when copper combines with oxygen, copper (II) oxide is formed. if 7.0 mol of copper reacts with 4.0 mil of oxygen, what amount of the excess reactant remains?

Question

Jesse Lutz

Chemistry

27 October, 11:59

when copper combines with oxygen, copper (II) oxide is formed. if 7.0 mol of copper reacts with 4.0 mil of oxygen, what amount of the excess reactant remains?

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Nigel · Answer 1

Answer: I believe that there are. 5 moles of O₂ left over.

Explanation: O₂ + 2 Cu = 2 CO₂ + 2 H₂O. With 7 moles of Cu you can get 7 moles of CuO. But, with 4 moles of O₂ you can get 8 moles of CuO, so O₂ is the limiting reactant. Thus, you would have to use 7 moles of Cu in order to determine the moles of O₂ and you get 3.5 moles of O₂. 4 moles - 3.5 moles =.5 moles