Arkansas State University
Department of Chemistry
and Physics
Answers
Theoretical Yield/ Percent Yield

 
 

1. Given the following equation:

a)  Balance the equation.

_____ K2PtCl4  + __2___ NH3   g  _____ Pt(NH3)2Cl2  + __2___ KCl

  b) Determine the theoretical yield of KCl if you start with 34.5 grams of NH3.    151 g KCl

 c) Starting with 34.5 g of NH3, and you isolate 76.4 g of Pt(NH3)2Cl2, what is the percent yield?  Theoretical yield = 303.9 g Pt(NH3)2Cl2;  25.14 % yield

2. Given the following equation:

  H3PO4    +     3 KOH    g   K3PO4     +  3 H2O

If 49.0 g of H3PO4 is reacted with excess KOH, determine the percent yield of K3PO4 if you isolate 49.0 g of K3PO4.   Theoretical yield = 106.1 g K3PO4; 46.17 % yield

3. Given the following equation:

  Al2(SO3)3    +  6 NaOH  g  3 Na2SO3    +   2 Al(OH)3

If you start with 389.4 g of Al2(SO3)3 and you isolate 212.4 g of Na2SO3, what is your percent yield for this reaction?  Theoretical yield = 500.6 g Na2SO3; 42.43 % yield

4. Given the following equation:

 Al(OH)3 (s)   +  3 HCl (aq)  g    AlCl3 (aq)   +   3 H2O (l)

If you start with 50.3 g of Al(OH)3 and you isolate 39.5 g of AlCl3, what is the percent yield?    Theoretical yield = 86.0 g AlCl3; 45.93 % yield