To balance the chemical reaction:

2HCl + 2RbHCO3 + SO4 + Zn2O -> 2RbCl + 2H2O + SO4 + ZnO

This balanced equation shows the reaction of Hydrochloric acid (HCl) with Rubidium bicarbonate (RbHCO3) producing Rubidium Chloride (RbCl), water (H2O), Sulfate ion (SO4) and Zinc oxide (ZnO).