Define found a percentage of copper in the brass samples

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Question- Suppose that a student performed the experiment and calculations perfectly except the following. Unknown to the student, Cu(NO3)2 times 3H2O instead of CuSO4 times 5H2O was used to make up the known Cu+2 solution. Using his data the student found a percentage of copper in the brass samples of 50%. Would this percentage be correct? If so why? If not what is the correct percentage?

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