When 200 ML of a 0

Multiple Choice

When 20.0 mL of a 0.250 M (NH₄) ₂S solution is added to 150.0 mL of a solution of Cu(NO₃) ₂, a CuS precipitate forms.The precipitate is then filtered from the solution, dried, and weighed.If the recovered CuS is found to have a mass of 0.3491 g, what was the concentration of copper ions in the original Cu(NO₃) ₂ solution?

A) 3.65 × 10^-3 M
B) 1.22 × 10^-2 M
C) 3.33 × 10^-2 M
D) 4.87 × 10^-2 M
E) 2.43 × 10^-2 M