Write the formula for a complex formed between zn2 and nh3, with a coordination number of 3.

 Triammine zinc sulfate

Explanation: In Zinc Sulfate (ZnSO4), Zinc atom exist in +2 oxidation state .

Thus 3 ammonia ligands can make a coordination complex with the Zinc Sulfate as shown below -

                 ZnSO4 + 3 NH3 →  [Zn(NH3)] SO4

This equation can also be written in its ionic form as

                  Zn²⁺ + 3NH₃ = [Zn(NH₃)₃]²⁺

well in order to answer this question you have to provide more information < 3

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.