How is Pb(NO3)2 2NaCl → PbCl2 2NaNO3 balanced

Explanation:

because lead is divalent, so NO3 must take 2 and because it take 2 in the reactants, it must take 2 in the products t be balanced. The same idea is on PbCl2. after editing the valency, you will find that NaCl needs 2 to make the equation full balanced.

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