Balance the given chemical equation in a stepwise manner:
$HCl + Zn \underset{}{\to}$ ${ZnCl}_{2} + H_{2}$

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Solution

A balanced chemical equation has the same atom count on both sides of the chemical equation. As the first step, count the number of atoms on the sides.
In the given equation, there is one hydrogen and chlorine atom on left-hand side while two hydrogen and chlorine atoms on right-hand side. The zinc atom count is the same on both sides.
Now, to balance the equation, multiply the atoms in such a way that the count becomes equal.
Multiply $H C l$ by 2 on the left-hand side and the equation becomes-
$2 H C l + Z n \underset{}{\to}$ $Z n C l_{2} + H_{2}$
It has an equal number of atoms on both sides. So, the equation is balanced.

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