The given equation is:
Ca(s) + HgNO$_3$(aq) → Ca(NO$_3$)$_2$(aq) + Hg(s)
To balance the equation, we need to make sure that the number of atoms of each element is the same on both sides of the equation.
On the left side, we have 1 Ca atom, 1 Hg atom, 1 N atom, and
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