H12 N4 O4 S Zn is the formula of Tetra ammine zinc sulfate.
The rule for writing chemical formula is as follow:
First, write the symbols with positive charge valency first. Then, write the valency of each atom on the top of its symbol.
Next, divide the valency number by their highest common factor ignore the positive or negative radicle.
Interchange the valency of the radicle.
At last, write the interchanged valency number to the lower right of the radicle.
To learn more about chemical formulas, refer brainly.com/question/11574373
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