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D e a r S t u d e n t M o l e c u l a r f o r m u l a o f p u r e c o m p o u n d w i t h C u^{+} i o n i s C u_{2} S . D u e t o i m p u r i t y o f C u^{2 +} i o n, m o l e c u l a r f o r m u l a b e c o m e s C u_{1.8} S . T o t a l l o s s o f C o p p e r = 2 - 1.8 = 0.2 m o l % o f C u^{2 +} i n t o t a l c o p p e r c o n t e n t = \frac{0.2}{1.8} \times 100 = 11.11 % M o l e p e r c e n t a g e o f C u^{2 +} i n t o t a l c o p p e r c o n t e n t i s 11.11 % O p t i o n 2 i s c o r r e c t . R e g a r d s

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