The balanced chemical equation for the reaction is:
PbO+2HCl→PbCl2+H2O
First, we calculate the number of moles of each reactant:
Molar mass of PbO=207.2+16=223.2 g mol−1.
Number of moles of PbO=223.2 g mol−16.5 g=0.0291 mol.
Molar mass of HCl=1+35.5=36.5 g mol−1.
Number of moles of HCl=36.5 g mol−13.2 g=0.0876 mol.
From the stoichiometry of the balanced equation, 1 mole of PbO requires 2 moles of HCl.
Therefore, 0.0291 moles of PbO will require 0.0291×2=0.0582 moles of HCl.
Since 0.0876 moles of HCl are available, HCl is in excess, making PbO the limiting reagent .
The amount of product formed is entirely dependent on the limiting reagent.
Since 1 mole of PbO yields 1 mole of PbCl2, 0.0291 moles of PbO will produce 0.0291 moles (approximately 0.029 moles) of PbCl2.