Percent Yield Worksheet - Mr. Midtgard's Chemistry Class

Name:_______________ Date:______________ Block:____________

Stoichiometry - Percent Yield Worksheet SHOW ALL WORK!!!!!

NOTE:

% Yield = Actual Yield x 100 Theoretical Yeild

Theoretical Yield = answer to your stoich problem. Actual Yield = given in the problem or the

experimental yield.

1) Balance the equation for the reaction of iron (III) phosphate with sodium sulfate to make iron (III) sulfate and sodium phosphate.

2FePO4 + 3Na2SO4 Fe2(SO4)3 + 2Na3PO4

a) If I perform this reaction with 100 grams of iron (III) phosphate and an excess of sodium sulfate, how many grams of iron (III) sulfate can I make?

b) If 74.0 grams of iron (III) sulfate are actually made when I do this reaction, what is my percent yield?

c) Is the answer from problem #3 reasonable? Explain.

Name:_______________ Date:______________ Block:____________ 2) LiOH + KCl LiCl + KOH

a) I began this reaction with 20 grams of lithium hydroxide. What is my theoretical yield of lithium chloride?

b) I actually produced 6 grams of lithium chloride. What is my percent yield?

3) C3H8 + 5 O2 3 CO2 + 4 H2O a) If I start with 5 grams of C3H8, what is my theoretical yield of water?

b) I got a percent yield of 75% How many grams of water did I make?

4) Be + 2 HCl BeCl2 + H2 My theoretical yield of beryllium chloride was 10.7 grams. If my actual yield was 4.5 grams, what was my percent yield?

Name:_______________ Date:______________ Block:____________ Stoichiometry - Percent Yield Worksheet - Key

1) Write the equation for the reaction of iron (III) phosphate with sodium sulfate to make iron (III) sulfate and sodium phosphate.

2 FePO4 + 3 Na2SO4 1 Fe2(SO4)3 + 2 Na3PO4

a) If I perform this reaction with 25 grams of iron (III) phosphate and an excess of sodium sulfate, how many grams of iron (III) sulfate can I make?

25/ = 1/3 = x

= 17.2 grams iron (III) sulfate

b) If 18.5 grams of iron (III) sulfate are actually made when I do this reaction, what is my percent yield?

(18.5 / 17.2) x 100% = 108% yield

c) Is the answer from problem #3 reasonable? Explain. No. Any yield over 100% is a violation of the Law of conservation of mass.

d) If I do this reaction with 15 grams of sodium sulfate and get a 65.0% yield, how many grams of sodium phosphate will I make?

According to the stoichiometry, the theoretical yield is 11.5 grams. Multiplying this by 0.650, you get 7.48 grams.

2)

3)

4)

 ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download