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Ways to Define Concentration

A certain sam...

Question

A certain sample of cuprous sulphide is found to have composition $C u_{1.8} S$ , because of incorporation of $C u^{2 +}$ ions in the lattice. What is the mole $%$ of $C u^{2 +}$ in total copper content in this crystal?

A

99.8 %

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B

11.11 %

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C

88.88 %

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D

None of these

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Solution

The correct option is C $11.11 %$
Let us consider the problem:
Two $C u^{+}$ replaced 1 $C u^{2 +}$ in $C u_{2} S$ sample.
Total loss of $C u = 0.2$ mole
Since of $C u^{2 +}$ in total copper content $= \frac{0.2}{1.8} \times 100 = 11.11 %$

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