In order to balance this equation, we need to ensure that the number of atoms of each element is equal on both sides of the equation.
Mg + 2 HCl → MgCl2 + H2
By adding a coefficient of 2 in front of HCl, we ensure that there are 2 atoms of hydrogen and 2 atoms of chlorine on the right side of the equation. This balancing of the equation ensures that both sides have the same number of atoms of each element involved.
Balance this equation:
Mg + HCl —> MgCl2 + H2
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