1. Write the chemical formula of the following molecules& show which is a Coordination compound of Cobalt, Magnesium and Iron:a. Vitamin B12b. Chlorophyllc. Haemoglobind. Myoglobin     2. Calculate the valence of the following:a. [Co (NH3)6]Cl3b. [Co(NH3)6]+3c. K2[Fe(EDTA)]          d. [Cu(NH3)4]SO4e. [Co(NH3)3Cl3]

1. The chemical formulas of the mentioned molecules are:

   a. Vitamin B12: C63H88CoN14O14P b. Chlorophyll: C55H72MgN4O5 c. Haemoglobin: C2952H4664O832N812S8Fe4 d. Myoglobin: C153H252N44O42

   Among these, Vitamin B12 is a coordination compound of Cobalt. Neither of the compounds is a coordination compound of Magnesium or Iron.

2. The valence of the following compounds can be calculated as:

   a. [Co (NH3)6]Cl3: The valence of Co in this compound is +3. b. [Co(NH3)6]+3: The valence of Co in this compound is +3. c. K2[Fe(EDTA)]: The valence of Fe in this compound is +3. d. [Cu(NH3)4]SO4: The valence of Cu in this compound is +2. e. [Co(NH3)3Cl3]: The valence of Co in this compound is +3.

The valence of a metal in a coordination compound can be determined by the charge of the complex ion. For example, in [Co(NH3)6]Cl3, the overall charge of the complex ion is +3, so the valence of Co is +3. Similarly, in [Cu(NH3)4]SO4, the overall charge of the complex ion is +2, so the valence of Cu is +2.