For the unbalanced equation:
We can balance by checking how many of each element there is in both sides.
We need to have the same number of H and Cl on both sides.
For now, the equation has 2 H and 2 Cl on the left side and 1 H and 1 Cl on the right side.
If we leave the coefficients of H₂ and Cl₂ as 1 and put a coefficient of 2 on HCl, we will get:
Now, we have 2 H on both sides and 2 Cl on both sides, so the equation is balanced.
Thus, the alanced equation is: