A certain sample of cuprous sulphide is found to have composition \( \mathrm{Cu}_{1.8} \mathrm{~...

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A certain sample of cuprous sulphide is found to have composition \( \mathrm{Cu}_{1.8} \mathrm{~S} \), because of incorporation of \( \mathrm{Cu}^{2+} \) ions in the lattice. What is the mole \( \% \) of \( \mathrm{Cu}^{2+} \) in total copper content in this crystal?
(a) \( 99.8 \% \)
(b) \( 11.11 \% \)
(c) \( 88.88 \% \)
(d) None of these
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