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 %