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# percentage mass watch

1. calculate the percentage of copper and oxygen in copper oxide given that when 3 g of it is reduced 2.4 g of copper is produced.
2. (Original post by bakastudent)
calculate the percentage of copper and oxygen in copper oxide given that when 3 g of it is reduced 2.4 g of copper is produced.
What have you done so far? If you don't know where to get started, remember that in the reduction reaction all the oxygen in copper oxide is being removed, so the change in mass will be equal to the mass of oxygen in that original sample of copper oxide.
3. (Original post by Plagioclase)
What have you done so far? If you don't know where to get started, remember that in the reduction reaction all the oxygen in copper oxide is being removed, so the change in mass will be equal to the mass of oxygen in that original sample of copper oxide.
thanks a lot, now i understand it.
but to make sure, do you get 44.4% and 55.6%?
4. (Original post by bakastudent)
thanks a lot, now i understand it.
but to make sure, do you get 44.4% and 55.6%?

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