Final answer:
To balance the equation ZnSO4 + Li2CO3 → ZnCO3 + Li2SO4, add a coefficient of 2 to HCl, resulting in Zn + 2HCl → ZnCl2 + H2.
Step-by-step explanation:
When balancing the equation ZnSO4 + Li2CO3 → ZnCO3 + Li2SO4, you will notice that the zinc atoms are already balanced, but the chlorine and hydrogen atoms are not. To balance the equation, you need to ensure that the chlorine atoms are also balanced on both sides of the equation. This can be achieved by giving HCl a coefficient of 2, resulting in the equation:
Zn + 2HCl → ZnCl2 + H2