To balance the chemical equation, we need to ensure that the number of atoms of each element on both sides of the equation is equal. FeS + HCl FeCl2 + H2SFirst, balance the Fe iron atoms:1 Fe on the left side and 1 Fe on the right side, so it's already balanced.Next, balance the S sulfur atoms:1 S on the left side and 1 S on the right side, so it's already balanced.Finally, balance the H hydrogen and Cl chlorine atoms:There are 1 H and 1 Cl on the left side, but 2 H and 2 Cl on the right side. To balance this, we need to add a coefficient of 2 in front of HCl:FeS + 2 HCl FeCl2 + H2SNow the equation is balanced:1 Fe, 1 S, 2 H, and 2 Cl on both sides of the equation.