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Question:

When 2.14 g of a copper compound is reduced, 0.545 g of copper metal (Cu) is produced as a result.?

What is the %Cu in the copper compound?What is the formula weight of the compound assuming only one copper per formula weight?What is the identity of the copper salt?

Answer:

%Cu = 0.545/2.14 = 25.47% 1 mole of Cu has a molar mass of 63.546 63.546 = 0.2547 x Molar Mass of Compound Molar Mass = 249.2 Compound might be CuSO4.5H2O (Molar Mass =249.7)
not enough info is given to do any thing other than guess the identity since this actually came out with a molar mass of 249.5 grams... CuSO4·5H2O has a molar mass of 249.7 and since none of the other commonly used copper salt come close...

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