Question

7.
A certain sample of cuprus sulphide is found
to have composition Cu1.8S, because of
presence of some Cu2+ ions in the lattice. What
is the mole % of Cu2+ in crystal ?
(1) 99.8%
(2) 11.11%
(3) 88.88%
(4) None of these
​

Answer 1

Solution

Two Cu+ replaced by one Cu2+ in Cu2S sample.

Total loss of Cu = 0.2 mole

∴ % of Cu2+ in total copper content

= 0.21.8×100=11.11

Answer 2

Answer =11.11

Hope it help u !!