A certain sample of cuprous sulphide is found to have composition \...

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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. What is the mole \( \% \) of \( \mathrm{Cu}^{+2} \) in total copper content in this crystal ?
(1) \( 22.22 \)
(2) \( 33.33 \% \)
(3) \( 11.11 \% \)
(4) \( 44.44 \% \)
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