PERCENT YIELD

1.)  Use the following information to answer the questions.  In the following reaction, 41.0
      grams of lead (II) chloride are reacted with excess sodium chromate.

                        ___ PbCl2  +  ___ Na2CrO4  à  ___ PbCrO4  +  ___ NaCl

            (A)  How many moles of lead (II) chromate will be produced?

            (B)  What is the theoretical yield (in grams) of sodium chloride in this reaction?

            (C)  If a student performed this experiment and recovered 16.5 grams of sodium
                chloride, what is the student’s percent yield?

 2.)  Use the following information to answer the questions.  In the following reaction, 1.70
       moles of zinc nitrate are reacted with excess chromium (II) phosphide.

                        ___ Zn(NO3)2  +  ___ Cr3P2  à  ___ Zn3P2  +  ___ Cr(NO3)2

(A)  What is the theoretical yield (in grams) of zinc phosphide?

(B)  If a student performed this experiment and recovered 149 grams of zinc
      phosphide, what is the student’s percent yield?

3.)  Use the following information to answer the questions.  In the following reaction, 10.0
      grams of copper (II) sulfate are reacted with excess iron (III) phosphate.

                        ___ CuSO4  +  ___ FePO4  à  ___ Cu3(PO4)2  +  ___ Fe2(SO4)3

(A)  How many grams of copper (II) phosphate can be produced?

(B)  If a student performed this experiment and recovered 6.70 grams of copper (II)
      phosphate, what is the student’s percent yield?

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Answers:           1.)        (A) 0.147 moles             (B) 17.2 g                      (C) 95.9 %
                        2.)        (A) 146 g                       (B) 102 %
                        3.)        (A) 7.95 g                      (B) 84.3 %