Determine the formula of the coordination complex below.

Amminetetraaquachromium(II) sulfate

Give the chemical formula for the compound below.

Potassium hexacyanoferrate(III)

What is the chemical formula for the following coordination complex?

Dichlorobis(ethylenediamine)chromium(III) chloride

Write the chemical formula for: Sodium hexanitrocobaltate(III).