The balanced chemical equation for the decomposition of zinc carbonate (ZnCO3) into zinc oxide (ZnO) and carbon dioxide (CO2) is:

ZnCO3(s) → ZnO(s) + CO2(g)

This equation is already balanced as it has:

* 1 Zn atom on both sides

* 1 C atom on both sides

* 3 O atoms on both sides

Therefore, the equation represents the decomposition of zinc carbonate into zinc oxide and carbon dioxide in a 1:1:1 molar ratio.