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+___ Na2CrO4ŗ___ 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 studentís 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+___ Cr3P2ŗ___ 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 studentís 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+___ FePO4ŗ___ 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 studentís 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 %