Answer:
2
Explanation:
The unbalanced reaction is shown below as:-
[tex]Pb(NO_3)_2+NaCl\rightarrow PbCl_2+NaNO_3[/tex]
On the left hand side,
There is 1 lead atom and 2 nitrogen atoms and 6 oxygen atoms and 1 sodium atom and 1 chlorine atom
On the right hand side,
There is 1 lead atom and 2 chlorine atoms and 3 oxygen atoms and 1 sodium atom
Thus,
Right side, [tex]NaNO_3[/tex] must be multiplied by 2 so to balance nitrogen and oxygen.
Left side, [tex]NaCl[/tex] is multiplied by 2 so to balance the whole reaction.
Thus, the balanced reaction is:-
[tex]Pb(NO_3)_2+2NaCl\rightarrow PbCl_2+2NaNO_3[/tex]
Coefficient of the sodium chloride in the balanced equation - 2
