Suppose You Are Studying Coordination Compounds of Co(II)with the Ligand

question 136

Multiple Choice

Suppose you are studying coordination compounds of Co(II) with the ligand pyridine (py,C₅H₅N,molar mass = 79.10) .You isolate a crystalline compound,and since the only available anions are Cl^- and NO₃^-,you hypothesize the empirical formula of the coordination compound must be Co_w(py) _x(Cl) _y(NO₃) _z.
-You discover that the complex decomposes in water.You dissolve 0.1000 g of the complex in H₂O and add excess NaHg(SCN) ₄,which precipitates Co(II) as CoHg(SCN) ₄(s) .After the precipitate is washed and dried,its mass is 0.1102 g.How many grams of cobalt are contained in 0.1000 g of the complex?

• A)0.1102
• B)0.0396
• C)0.0132
• D)0.437
• E)0.0548

---

Definitions:

Commission

A payment or reward given for completing a service or achieving a goal, often calculated as a percentage of the sales or transactions made.

Omission

The act of leaving out or excluding something, either intentionally or unintentionally.

Imprecision

The state of being vague, not exact, or unclear, often leading to errors, misunderstandings or a lack of exactness.

Meetings

Formal or informal gatherings of individuals or groups to discuss topics of mutual interest, make decisions, or exchange information.