Stoichiometry involving Lead

Question: 2.00 mol of Pb(NO₃)₂ is reacted with 3.00 mol of NaCl, determine how grams of PbCl are produced.  Also, find how much Pb(NO₃)_{2 will be leftover.
Stoichiometry:}

2.00 mol Pb(NO₃)_{2 x    2 mol NaCl    = 4.00 mol NaCl needed}

                              1 mol Pb(NO₃)₂

_{3.00 mol NaCl x I mol PbCl   x  242.65 g PbCl  = 363.975 grams of PbCl}

                        _{2 mol NaCl       1 mol PbCl}

1.5 mol PbCl x 1 mol Pb(NO₃)_{2 = 1.50 mol} Pb(NO₃)_{2 used up.} 

                      _{1 mol PbCl}

  _{2.00 mol available of} Pb(NO₃)₂

_{- 1.50 mol used up of Pb(NO3)2}

  _{0.50 mol left over of} Pb(NO₃₎₂

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Question: What is the volume of carbon dioxide gas at STP from the decomposition of 8.54g of lead carbonate?


PbCO₃(s) > 2PbO(s) + CO₂(g)


Stoichiometry: 

8.54 g PbCO₃ x   1 mol PbCO₃      x  1 mol CO₂     x   22.4 L CO₂  = .7159 L CO₂ at STP
                        267.21 g PbCO₃     1 mol PbCO₃        1 mol CO₂