If I start with 25.0 grams of lead (II) nitrate and 15.0 grams of sodium iodide, how many grams of sodium nitrate can be formed?

1)         LiOH + HBr à LiBr + H₂O

 

            If you start with ten grams of lithium hydroxide, how many grams of lithium bromide will be produced?

 

 

 

2)         C₂H₄ + 3 O₂ à 2 CO₂ + 2 H₂O       

 

            If you start with 45 grams of ethylene (C₂H₄), how many grams of carbon dioxide will be produced?

 

 

 

3)         Mg + 2 NaF à MgF₂ + 2 Na

 

            If you start with 5.5 grams of lithium chloride, how many grams of calcium chloride will be produced?

 

 

 

4)         2 HCl + Na₂SO₄ à 2 NaCl + H₂SO₄

 

            If you start with 20 grams of hydrochloric acid, how many grams of sulfuric acid will be produced?

  

 

Limiting Reagent Worksheet

 

1)         Write the balanced equation for the reaction of lead (II) nitrate with sodium iodide to form sodium nitrate and lead (II) iodide:

 

 

 

2)         If I start with 25.0 grams of lead (II) nitrate and 15.0 grams of sodium iodide, how many grams of sodium nitrate can be formed?

 

 

 

3)         What is the limiting reagent in the reaction described in problem 2?

 

 

 

4)         How much of the nonlimiting reagent will be left over from the reaction in problem #2?

 

  

Percent, Actual, and Theoretical Yield

 

1)         LiOH + KCl à 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?

 

 

2)         C₃H₈ + 5 O₂ à 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?

 

 

 

3)         Be + 2 HCl à 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?

 

 

 

4)         2 NaCl + CaO à CaCl₂ + Na₂O

 

            What is my theoretical yield of sodium oxide if I start with 20 grams of calcium oxide?

 

5)         FeBr₂ + 2 KCl à FeCl₂ + 2 KBr

 

            a)  What is my theoretical yield of iron (II) chloride if I start with 34 grams of iron (II) bromide?

 

 

 

            b)  What is my percent yield of iron (II) chloride if my actual yield is 4 grams?

 

 

6)         TiS + H₂O à H₂S + TiO

 

            What is my percent yield of titanium (II) oxide if I start with 20 grams of titanium (II) sulfide and my actual yield of titanium (II) oxide is 22 grams?

 

 

7)         U + 3 Br₂ à UBr₆

 

            What is my actual yield of uranium hexabromide if I start with 100 grams of uranium and get a percent yield of 83% ?

 

 

         H₂SO₄ à H₂O + SO₃

 

            If I start with 89 grams of sulfuric acid and produce 7.1 grams of water, what is my percent yield?

 

 

STOICHIOMETRY part 1

Show all work using dimensional analysis!

1. 4 Na + O2 —-> 2 Na2O

a) How many moles of sodium (Na) would be needed to react with 3.82 moles of oxygen (O2)?

Ans ________

 

b) How many moles of Na2O can be produced from 13.5 moles Na?

Ans ________

 

c) How many moles of O2 are needed to produce 34.7 g of Na2O?

Ans ________

 

2. C2H4 + 3 O2 —> 2 CO2 + 2 H2O

a) When 0.624 moles of O2 are reacted, how many moles of carbon dioxide are produced?

Ans ________

 

b) How many grams of C2H4 are needed to produce 3.7 moles of water?

Ans ________

 

c) how many grams of O2 are needed to react with 2.56 g of C2H4?

Ans ________

 

3. N2 + 3 F

2 —>2 Na2O

 

 

a) When 62.0 g of fluorine are reacted, how many moles of NF3 will be formed?

Ans ________

 

b) How many molecules of N2 are needed to produce 2.85 g of NF3?

Ans ________

 

c) 3.54 g of nitrogen will react with how many grams of fluorine?

Ans ________

 

4. 4 NH3 + 7 O2 —> 4 NO2 + 6 H2O

a) What mass of NO2 can be produced from 3.56 x 1022 molecules of oxygen?

Ans ________

 

b) 13.8 g of NH3 would be able to produce how many moles of H2O?

Ans ________

 

c) How many grams of O2 are needed to produce 15.5 g of H2O?

Ans ________

 

 

STOICHIOMETRY part 2

Show all work using dimensional analysis!

1. 3 cups flour + 1 egg —> 1 loaf bread

a) If you have 12 cups of flour and 3 eggs, how many loaves of bread can you make?

Ans: _______

 

 

b) Which ingredient do you run out of first (limiting reactant)? Ans: ___________

 

 

2. 2 Al + 6 HCl —-> 3 H2 + 2 AlCl 3

a) If you start with 205 g of aluminum and 75.6 g of HCl, how many grams of H2 can be made?

Ans ________

 

 

b) What is the limiting reagent? ………………………………………………. Ans ____________

 

 

c) Suppose you only made 1.98 g of H2. What is your % yield?

Ans ________

 

 

3. 2 Fe2S3 + 3 C —-> 4 Fe + 3 CS2

a) How many grams of iron can be made from 119 g of Fe2S3 and 12.7 g C?

Ans ________

 

 

b) What is the limiting reagent? ……………………………………………… Ans ____________

 

 

c) After the above reaction, you produce 35.6 g of Fe. What is your % yield?

Ans ________

 

4. 6 CO2 + 6 H2O —-> C6H12O6 + 6 O2

a) How many grams of sugar can be made from 50.0 g of CO2 and 50.0 g of water?

Ans ________

 

 

b) What is the limiting reagent? ………………………………………………. Ans ____________

 

 

c) What is the excess reagent? ………………………………………………. Ans ____________

 

 

BONUS How many grams of the excess reagent are leftover?

(hint- you’ll need to use stoichiometry to solve this!)

Ans ________