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A sample of copper sulphate pentahydrate, `CuSO_(4). 5H_2O` contains `3.782g` of `Cu`. How many grams of oxygen are in this sample?

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A sample of copper sulphate pentahydrate, `CuSO_(4). 5H_2O` contains `3.782g` of `Cu`. How many grams of oxygen are in this sample?
A. `0.952 g`
B. `3.809 g`
C. `4.761 g `
D. `8.576 g`
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Correct Answer - D
`CuCO_(4).5H_(2)O` has 1 mol of copper and 9 moles of oxygen atoms.
`63.5 g Cu = 9xx16 g` of oxygen
`3.782 g Cu = (9xx16xx3.782)/(63.5) = 8.576` of oxygen
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