Suppose you want to know how many moles of NaCl are required to react completely with 1.5 moles of Pb (NO3)2

Question

Balanced = 2NaCl+ Pb (NO3)2 = 2aNO3 + PbCl2

Answer 1

2NaCl+ Pb (NO₃)₂ = 2NaNO₃ + PbCl₂ .. balanced equation

From this balanced equation we see that 2 MOLES of NaCl react with ONE mole Pb(NO₃)₂. This is known as the stoichiometry of the equation. So, it's now simple to find how many moles of NaCl will react with 1.5 moles of Pb(NO₃)₂

1.5 mols Pb(NO₃)₂ x 2 mols NaCl / 1 mol Pb(NO₃)₂ = 3 mols NaCl